JP2018532353A - A-MPDU reception status indication method and reception end device - Google Patents

Abstract

The present invention provides an A-MPDU reception state indication method and a receiving apparatus in order to indicate the reception state of an A-MPDU including an MSDU fragment. When the receiving end determines that the receiving end receives an A-MPDU transmitted by the transmitting end and that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of the MSDU The receiving end transmits an acknowledgment frame used to indicate the reception state of the A-MPDU to the transmitting end, wherein the acknowledgment frame includes a fragment indication field and a reception status field, and the fragment indication field includes A -The MPDU is used to indicate that it contains an MPDU obtained by encapsulating an MSDU fragment, and the reception status field is used to indicate the reception status of each MPDU in the A-MPDU, and the reception status field The predetermined number of bits is a step used to indicate the reception status of MPDUs having the same sequence number (SN). Including and up, the.

Description

  This application is filed with Chinese Patent Application No. 2015015551675. entitled “A-MPDU Reception State Indication Method and Receiving End Device” filed with the Chinese Patent Office on September 1, 2015. Claims priority over No. X, the entirety of which is incorporated herein by reference.

  The present invention relates to the field of communications, and more particularly, to an A-MPDU reception state instruction method and a reception apparatus.

  Fragmentation technology was introduced in the 802.11b protocol that supports low rate data transmission. The so-called fragmentation technique is a medium access control (MAC) layer in which a MAC service data unit (MSDU) or a MAC MAC protocol data unit (MMPDU) is a plurality of segments. Each segment is called an MSDU or MMPDU fragment. When the fragment reception fails, the fragmentation technique can retransmit only the fragment for which reception has failed, and there is no need to retransmit the entire MSDU or MMPDU, thereby improving the robustness and throughput of the network.

  In order to support higher data transmission rates, aggregate-management protocol data unit (A-MPDU) technology has been introduced into the 802.11n protocol. A-MPDU technology means that a MAC protocol data unit (MPDU) is obtained by encapsulating MSDU or aggregate MAC service data unit (aggregate MSDU, A-MSDU). Is transmitted in an aggregated manner. Aggregate MPDUs are distinguished using MPDU delimiters. In one A-MPDU, up to 64 encapsulated MSDUs can be aggregated for transmission. In the A-MPDU technique, the reception state of the A-MPDU is fed back using a block acknowledgment (BA) frame. Each bit in the BA bitmap included in the BA frame correspondingly indicates the reception status of one MSDU or A-MSDU. The first bit of the BA bitmap correspondingly indicates the reception status of the MSDU of the first sequence number (sequence number, SN) in the BA start sequence control field.

  In the 802.11ax protocol of a new generation of wireless local area network (WLAN) systems, orthogonal frequency division multiple access (OFDMA) technology has been introduced. Multiple users using OFDMA technology transmit data on different subchannels. As shown in FIG. 1, a plurality of stations (Stations, STAs) transmit A-MPDUs on corresponding subchannels. Each MPDU in the aforementioned A-MPDU is obtained by encapsulating one MSDU or one A-MSDU and cannot be obtained by encapsulating a fragment of the MSDU. Multiple stations can use pad (Pad) bits to align data transmitted by multiple stations in time. Thereafter, the MSDU or A-MSDU fragment can be transmitted using the resources occupied by the pad bits to improve the transmission efficiency. Therefore, new generation WLAN systems need to support both MSDU fragmentation and A-MPDU technologies. That is, the MPDU in the A-MPDU can be obtained by encapsulating the MSDU or A-MSDU, or can be obtained by encapsulating the MSDU fragment or the A-MSDU fragment. For ease of explanation, the MSDU fragment in the following description may be understood as an A-MSDU fragment.

  Since the existing compressed BA frame can only indicate the reception state of the A-MPDU including the MPDU obtained by encapsulating only the MSDU, it can be obtained by encapsulating the MSDU fragment in the new generation WLAN system. A reception status of A-MPDU including MPDU cannot be indicated. Currently, in a new generation WLAN system, the reception status of A-MPDU including MPDU obtained by encapsulating MSDU fragment can be indicated using the following two solutions. However, there are some drawbacks. Details are as follows.

  Solution 1: The method of assigning the MSDU SN is changed.

  A unique SN is assigned to the MSDU or MSDU fragment. In this way, different fragments of the same MSDU do not have the same SN, but each SN. Two bits of the sequence control field of the MPDU are used to indicate MSDU fragments belonging to the same MSDU. Each bit in the compressed BA frame is used to indicate the reception status of the MSDU or MSDU fragment corresponding to one SN. Therefore, the reception end indicates the reception state of the A-MPDU by transmitting the compressed BA frame to the transmission end. In Solution 1, the existing scheme for assigning MSDU SNs is modified and the solution is relatively complex. If the indication of the bits used to indicate MSDU fragments belonging to the same MSDU is inaccurate, the receiving side will incorrectly assume that fragments coming from multiple MSDUs belong to the same MSDU.

  Solution 2: In A-MPDU, the number of fragments of the same MSDU is limited.

  Although one A-MPDU can contain multiple MSDU fragments, it is specified that one A-MPDU contains only one fragment of the same MSDU. Thus, each bit in the compressed BA frame can indicate the reception status of the MSDU or MSDU fragment according to the SN sequence. Therefore, the reception end indicates the reception state of the A-MPDU by transmitting the compressed BA frame to the transmission end. Therefore, in Solution 2, multiple fragments of the same MSDU cannot be aggregated into one A-MPDU for transmission.

  In conclusion, the reception status of A-MPDU containing MSDU fragments cannot be shown well by adopting the existing solution, and the existing solution has some drawbacks.

  The present invention provides an A-MPDU reception state instruction method, an MSDU fragment reception state instruction method, a reception apparatus, and a transmission apparatus in order to indicate the reception state of an A-MPDU including an MSDU fragment.

  Specific technical solutions of the embodiments of the present invention are as follows.

According to a first aspect, an embodiment of the present invention provides a reception status indication method for an aggregate MAC protocol data unit (A-MPDU). This method
A receiving end receiving the A-MPDU transmitted by the transmitting end;
If it is determined that at least one MAC protocol data unit (MPDU) in the A-MPDU is obtained by encapsulating a fragment of the medium access control service data unit (MSDU), the receiving end is the transmitting end, and the A-MPDU is Transmitting an acknowledgment frame used to indicate the reception status of
Including
The acknowledgment frame includes a fragment indication field and a reception status field, and the fragment indication field is used to indicate that the A-MPDU includes an MPDU obtained by encapsulating the MSDU fragment, and the reception status field is A -Used to indicate the reception status of each MPDU in the MPDU, and a predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Are used to indicate one MPDU of the sequence of the sequence number (SN) in the A-MPDU.

With respect to the first aspect, in a first possible implementation manner, the receiving end determines that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of an MSDU.
When the receiving end determines that the fragment number (FN) field included in at least one MPDU in the A-MPDU includes other than 0, the receiving end encapsulates the MSDU fragment in at least one MPDU in the A-MPDU. The step of determining that obtained by
including.

With respect to the first aspect, in a second possible implementation manner, when the acknowledgment frame uses a frame format of a multi-user block acknowledgment (M-BA) frame, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the M-BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field in the M-BA frame;
Is used.

With respect to the first aspect, in a third possible implementation manner, when the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the compressed BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field of a BA control field in a compressed BA frame, or
A format in which the fragment indication field includes one or more bits out of eight reserved bits of the BA control field of the compressed BA frame, or
A format in which the fragment indication field includes a multi-traffic identifier (Multi-TID) bit, a compressed bitmap bit, and a GCR (Groupcast with Retries) bit of the BA control field of the compressed BA frame;
Is used.

  With respect to the first aspect, in a fourth possible implementation scheme, for the bits of the reception status field used to indicate the reception status of MPDUs having the same SN, the predetermined number of bits is the maximum allowed number of MSDU fragments. It is greater than or equal to the value.

According to a second aspect, an embodiment of the present invention provides a receiving device. This receiving device
A receiving unit configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device;
When determining that at least one MAC protocol data unit (MPDU) in the A-MPDU received by the receiving unit is obtained by encapsulating a fragment of a medium access control service data unit (MSDU), A determination unit configured to determine an acknowledgment frame used to indicate a reception state;
A transmission unit configured to transmit an acknowledgment frame determined by the determination unit to the transmission device;
Is provided. The acknowledgment frame includes a fragment indication field and a reception status field, and the fragment indication field is used to indicate that the A-MPDU includes an MPDU obtained by encapsulating the MSDU fragment, and the reception status field is A -Used to indicate the reception status of each MPDU in the MPDU, and a predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Are used to indicate one MPDU of the sequence of the sequence number (SN) in the A-MPDU.

With respect to the second aspect, in a first possible implementation manner, when determining that at least one MPDU in the A-MPDU received by the receiving unit is obtained by encapsulating a fragment of MSDU, ,In particular,
When it is determined that the fragment number (FN) field included in at least one MPDU in the A-MPDU includes other than 0, the at least one MPDU in the A-MPDU is obtained by encapsulating the MSDU fragment. Configured to determine.

With respect to the second aspect, in a second possible implementation manner, when the acknowledgment frame uses a multi-user block acknowledgment (M-BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the M-BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field in the M-BA frame;
Is used.

With respect to the second aspect, in a third possible implementation manner, when the acknowledgment frame uses the frame format of a compressed block acknowledgment (BA) frame, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the compressed BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field of a BA control field in a compressed BA frame, or
A format in which the fragment indication field includes one or more bits out of eight reserved bits of the BA control field of the compressed BA frame, or
A format in which the fragment indication field includes a multi-traffic identifier (Multi-TID) bit, a compressed bitmap bit, and a GCR (Groupcast with Retries) bit of the BA control field of the compressed BA frame;
Is used.

  With respect to the second aspect, in a fourth possible implementation scheme, for the bits of the reception status field used to indicate the reception status of MPDUs having the same SN, the predetermined number of bits is the maximum allowed number of MSDU fragments. It is greater than or equal to the value.

According to a third aspect, an embodiment of the present invention provides a receiving device. This receiving device
A transceiver configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by a transmitting device;
When determining that at least one MAC protocol data unit (MPDU) in an A-MPDU received by the transceiver was obtained by encapsulating a fragment of a medium access control service data unit (MSDU), A processor configured to determine an acknowledgment frame used to indicate a reception state;
Is provided. The transceiver is further configured to transmit an acknowledgment frame determined by the processor to the transmitting device;
The acknowledgment frame includes a fragment indication field and a reception status field, and the fragment indication field is used to indicate that the A-MPDU includes an MPDU obtained by encapsulating the MSDU fragment, and the reception status field is A -Used to indicate the reception status of each MPDU in the MPDU, and a predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Are used to indicate one MPDU of the sequence of the sequence number (SN) in the A-MPDU.

With respect to the third aspect, in a first possible implementation manner, when determining that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU, the processor specifically specifies:
When it is determined that the fragment number (FN) field included in at least one MPDU in the A-MPDU includes other than 0, the at least one MPDU in the A-MPDU is obtained by encapsulating the MSDU fragment. Configured to determine.

With respect to the third aspect, in a second possible implementation manner, when the acknowledgment frame uses a multi-user block acknowledgment (M-BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the M-BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field in the M-BA frame;
Is used.

With respect to the third aspect, in a third possible implementation manner, when the acknowledgment frame uses the frame format of a compressed block acknowledgment (BA) frame, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the compressed BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field of a BA control field in a compressed BA frame, or
A format in which the fragment indication field includes one or more bits out of eight reserved bits of the BA control field of the compressed BA frame, or
A format in which the fragment indication field includes a multi-traffic identifier (Multi-TID) bit, a compressed bitmap bit, and a GCR (Groupcast with Retries) bit of the BA control field of the compressed BA frame;
Is used.

  With respect to the third aspect, in a fourth possible implementation manner, for the bits of the reception status field used to indicate the reception status of MPDUs having the same SN, the predetermined number of bits is the maximum allowed number of MSDU fragments. It is greater than or equal to the value.

According to a fourth aspect, an embodiment of the present invention provides a reception status indication method for an aggregate MAC protocol data unit (A-MPDU). This method
A receiving end receiving the A-MPDU transmitted by the transmitting end;
The receiving end transmits to the transmitting end an acknowledgment frame used to indicate the reception status of the A-MPDU, the acknowledgment frame including a block acknowledgment bitmap field, and each bit in the block acknowledgment bitmap field Are used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU;
including.

  With respect to the fourth aspect, in a first possible implementation manner, the acknowledgment frame further includes an A-MPDU identification field. The A-MPDU identification field is used by the transmitting end to distinguish between an A-MPDU and another A-MPDU transmitted by the transmitting end.

  With respect to the first possible implementation manner of the fourth aspect, in the second possible implementation manner of the fourth aspect, the A-MPDU identification field is a sequence number (included in the first MPDU in the A-MPDU). SN) and fragment number (FN).

According to a fifth aspect, an embodiment of the present invention provides a receiving device. This receiving device
A receiving unit configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device;
A decision unit configured to determine an acknowledgment frame used to indicate a reception status of an A-MPDU received by a receiving unit, the acknowledgment frame including a block acknowledgment bitmap field, and a block acknowledgment bitmap Each bit in the field is a decision unit used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU;
A transmission unit configured to transmit an acknowledgment frame determined by the determination unit to the transmission device;
Is provided.

  With respect to the fifth aspect, in a first possible implementation manner, the acknowledgment frame further includes an A-MPDU identification field. The A-MPDU identification field is used by the transmitting device to distinguish between an A-MPDU and another A-MPDU transmitted by the transmitting device.

  With respect to the first possible implementation manner of the fifth aspect, in the second possible implementation manner of the fifth aspect, the A-MPDU identification field is a sequence number included in the first MPDU in the A-MPDU ( SN) and fragment number (FN).

According to a sixth aspect, an embodiment of the present invention provides a receiving device. This receiving device
A transceiver configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by a transmitting device;
A processor configured to determine an acknowledgment frame used to indicate a reception status of an A-MPDU received by a transceiver, the acknowledgment frame including a block acknowledgment bitmap field, wherein the block acknowledgment bitmap field Each of the bits in the processor used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU;
Is provided. The transceiver is further configured to transmit the acknowledgment frame determined by the processor to the transmitting device.

  With respect to the sixth aspect, in a first possible implementation manner, the acknowledgment frame further includes an A-MPDU identification field. The A-MPDU identification field is used by the transmitting device to distinguish between an A-MPDU and another A-MPDU transmitted by the transmitting device.

  With respect to the first possible implementation manner of the sixth aspect, in the second possible implementation manner of the sixth aspect, the A-MPDU identification field is a sequence number included in the first MPDU in the A-MPDU ( SN) and fragment number (FN).

According to a seventh aspect, an embodiment of the present invention provides a reception status indication method for a medium access control service data unit (MSDU) fragment. This method
A transmitting end transmitting an aggregate MAC protocol data unit (A-MPDU) including an MSDU fragment to a receiving end;
A transmitting end transmitting a request frame to the receiving end, wherein the request frame is used to request an indication of a reception state of an MSDU fragment included in the A-MPDU;
The transmitting end receives a response frame transmitted by the receiving end, and the response frame is used to indicate a reception state of the MSDU fragment included in the A-MPDU.

  With respect to the seventh aspect, in a first possible implementation manner, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Regarding the seventh aspect, in a second possible implementation manner, when the transmitting end transmits an A-MPDU including an MSDU fragment to a plurality of receiving ends, the request frame is sent to the plurality of receiving ends, respectively, and a response frame to the transmitting end. Is used to request that The request frame includes information about the association between the identification information of each receiving end of the plurality of receiving ends and the sequence number (SN) of the MSDU fragment received by the receiving end.

  Regarding the seventh aspect, in a third possible implementation manner, when the transmitting end transmits all fragments of MSDU to the receiving end using at least one A-MPDU, the request frame transmitted by the transmitting end is: Used to request an indication of the reception status of each fragment of the MSDU, and the response frame received by the transmitting end is used to indicate the reception status of each fragment of the MSDU.

According to an eighth aspect, an embodiment of the present invention provides a reception status indication method for a medium access control service data unit (MSDU) fragment. This method
A receiving end receiving an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting end and including an MSDU fragment;
A receiving end receiving a request frame transmitted by the transmitting end, wherein the request frame is used to request an indication of a reception state of an MSDU fragment included in the A-MPDU;
A receiving end transmitting a response frame to the transmitting end, wherein the response frame is used to indicate a reception state of an MSDU fragment included in the A-MPDU;
including.

  With respect to the eighth aspect, in a first possible implementation manner, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Regarding the eighth aspect, in a second possible implementation manner, when the transmitting end transmits an A-MPDU including an MSDU fragment to a plurality of receiving ends, a request frame is sent to each of the plurality of receiving ends and a response frame to the transmitting end. Is used to request that The request frame includes the sequence number (SN) of the MSDU fragment received by each of the plurality of receiving ends.

  With respect to the eighth aspect, in a third possible implementation manner, the request received by the receiving end when the receiving end receives all fragments of the MSDU transmitted by the transmitting end using at least one A-MPDU. The frame is used to request an indication of the reception state of each fragment of the MSDU, and the response frame transmitted from the reception end to the transmission end is used to indicate the reception state of each fragment of the MSDU.

According to a ninth aspect, an embodiment of the present invention provides a transmission device. This transmission device
A transmission unit configured to transmit an aggregate MAC protocol data unit (A-MPDU) including a medium access control service data unit (MSDU) fragment to a reception device and to transmit a request frame to the reception device, the request unit comprising: The frame is a transmission unit used to request an indication of the reception status of the MSDU fragment included in the A-MPDU;
A receiving unit configured to receive a response frame transmitted by a receiving device, wherein the response frame is used to indicate a reception state of an MSDU fragment included in an A-MPDU transmitted by the transmitting unit; A receiving unit;
Is provided.

  With respect to the ninth aspect, in a first possible implementation manner, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  With respect to the ninth aspect, in a second possible implementation manner, when the transmitting unit transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame is sent to each of the plurality of receiving devices as a response frame to the transmitting device. Is used to request that The request frame includes information regarding the association between the identification information of each of the plurality of receiving apparatuses and the sequence number (SN) of the MSDU fragment received by the receiving apparatus.

  With respect to the ninth aspect, in a third possible implementation manner, when the transmitting unit transmits all fragments of the MSDU to the receiving device using at least one A-MPDU, the request frame transmitted by the transmitting unit is: Used to request an indication of the reception status of each fragment of the MSDU, and the response frame received by the receiving unit is used to indicate the reception status of each fragment of the MSDU.

According to a tenth aspect, an embodiment of the present invention provides a receiving device. This receiving device
A receiving unit configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by a transmitting device and including a medium access control service data unit (MSDU) fragment and to receive a request frame transmitted by the transmitting device The request frame is a receiving unit used to request an indication of the reception status of the MSDU fragment included in the A-MPDU;
A determination unit configured to determine a response frame, wherein the response frame is used to indicate a reception status of an MSDU fragment included in an A-MPDU received by the receiving unit;
A transmission unit configured to transmit the response frame determined by the determination unit to the transmission device;
Is provided.

  With respect to the tenth aspect, in a first possible implementation manner, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  With respect to the tenth aspect, in a second possible implementation manner, when the transmitting device transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame received by the receiving unit is transmitted to the plurality of receiving devices. Each is used to request the transmitting device to transmit a response frame. The request frame includes the sequence number (SN) of the MSDU fragment received by each of the plurality of receiving apparatuses.

  With respect to the tenth aspect, in a third possible implementation manner, the request received by the receiving unit when the receiving unit receives all fragments of the MSDU transmitted by the transmitting device using at least one A-MPDU. The frame is used to request an indication of the reception status of each fragment of the MSDU, and the response frame transmitted by the transmission unit to the transmission device is used to indicate the reception status of each fragment of the MSDU.

According to an eleventh aspect, an embodiment of the present invention provides a transmission device. This transmission device
An aggregate MAC protocol data unit (A-MPDU) that includes a medium access control service data unit (MSDU) fragment is transmitted to the receiving device, configured to transmit a request frame to the receiving device, and transmitted by the receiving device. The request frame is used to request an indication of the reception status of the MSDU fragment included in the A-MPDU, and the response frame is sent to the A-MPDU. A transceiver used to indicate the reception status of included MSDU fragments;
Is provided.

  With respect to the eleventh aspect, in a first possible implementation manner, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Regarding the eleventh aspect, in a second possible implementation manner, when the transceiver transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame is sent to each of the plurality of receiving devices as a response frame to the transmitting device. Is used to request that The request frame includes information regarding the association between the identification information of each of the plurality of receiving apparatuses and the sequence number (SN) of the MSDU fragment received by the receiving apparatus.

  With respect to the eleventh aspect, in a third possible implementation manner, when the transceiver transmits all fragments of the MSDU to the receiving device using at least one A-MPDU, the request frame transmitted by the transceiver is Used to request an indication of the reception status of each MSDU fragment, and the response frame received by the transceiver is used to indicate the reception status of each MSDU fragment.

According to a twelfth aspect, an embodiment of the present invention provides a receiving device. This receiving device
A transceiver configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by a transmitting device and including a medium access control service data unit (MSDU) fragment and to receive a request frame transmitted by the transmitting device The request frame is a transceiver used to request an indication of the reception status of the MSDU fragment included in the A-MPDU;
A processor configured to determine a response frame, wherein the response frame is used to indicate a reception status of an MSDU fragment included in the A-MPDU received by the transceiver;
Is provided. The transceiver is further configured to transmit the response frame determined by the processor to the transmitting device.

  With respect to the twelfth aspect, in a first possible implementation manner, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Regarding the twelfth aspect, in a second possible implementation manner, when the transmitting device transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame received by the transceiver is transmitted to the plurality of receiving devices. Each is used to request the transmitting device to transmit a response frame. The request frame includes the sequence number (SN) of the MSDU fragment received by each of the plurality of receiving apparatuses.

  Regarding the twelfth aspect, in a third possible implementation manner, the request received by the receiving device when the receiving device receives all fragments of the MSDU transmitted by the transmitting device using at least one A-MPDU. The frame is used to request an indication of the reception status of each fragment of the MSDU. The response frame transmitted from the receiving apparatus to the transmitting apparatus is used to indicate the reception status of each MSDU fragment.

According to a thirteenth aspect, an embodiment of the present invention provides an aggregate MAC protocol data unit (A-MPDU) reception status indication method. This method
A transmitting end assigning a sequence number to each MAC protocol data unit (MPDU) in the A-MPDU;
A transmitting end transmitting an A-MPDU to a receiving end, wherein each MPDU in the A-MPDU carries a sequence number of each MPDU;
A transmitting end receiving an acknowledgment frame transmitted by the receiving end, wherein the acknowledgment frame includes an indication field used to indicate a reception state of each MPDU in the A-MPDU, and each bit of the indication field Is used to indicate one MPDU of a sequence of sequence numbers in an A-MPDU;
including.

Regarding the thirteenth aspect, in a first possible implementation manner, the transmitting end assigns a sequence number to each MAC protocol data unit (MPDU) in the A-MPDU,
When it is determined that at least one MPDU in the A-MPDU is obtained by encapsulating a medium access control service data unit (MSDU) fragment, the transmitting end assigns a sequence number to each MPDU in the A-MPDU. Assigning steps,
including.

  Regarding the thirteenth aspect, in a second possible implementation scheme, the sequence number is carried in the medium access control header of the MPDU.

  Regarding the thirteenth aspect, in a third possible implementation manner, when the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap in the compressed BA frame. It is a field.

  Regarding the thirteenth aspect, in a fourth possible implementation manner, the acknowledgment frame further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

According to a fourteenth aspect, an embodiment of the present invention provides a reception status indication method for an aggregate MAC protocol data unit (A-MPDU). This method
A receiving end receiving an A-MPDU transmitted by the transmitting end, wherein each MAC protocol data unit (MPDU) of the A-MPDU carries a sequence number of each MAC protocol data unit (MPDU); When,
The receiving end transmits an acknowledgment frame to the transmitting end, and the acknowledgment frame includes an indication field used to indicate a reception state of each MPDU in the A-MPDU, and each bit of the indication field includes A -Used to indicate one MPDU of a sequence of MPDU sequence numbers within the MPDU;
including.

  Regarding the fourteenth aspect, in the first possible implementation manner, the sequence number is carried in the medium access control header of the MPDU.

  Regarding the fourteenth aspect, in a second possible implementation manner, when the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap in the compressed BA frame. It is a field.

Regarding the fourteenth aspect, in a third possible implementation manner, before the step of the receiving end transmitting an acknowledgment frame to the transmitting end, the method further comprises:
When each MPDU in the A-MPDU is determined to carry the sequence number of each MPDU, the receiving end determines that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of the MSDU ,
including. The acknowledgment frame further includes a fragment indication field, which is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

According to a fifteenth aspect, an embodiment of the present invention provides a transmission device. This transmission device
An allocation unit configured to assign a sequence number to each MAC protocol data unit (MPDU) in the aggregate MAC protocol data unit (A-MPDU);
A transmission unit configured to transmit an A-MPDU to a receiving device, wherein each MPDU in the A-MPDU carries a sequence number assigned by the assignment unit;
A receiving unit configured to receive an acknowledgment frame transmitted by a receiving device, wherein the acknowledgment frame is used to indicate a receiving state of each MPDU in the A-MPDU transmitted by the transmitting unit. Each bit of the indication field includes a receiving unit used to indicate one MPDU of a sequence of sequence numbers in the A-MPDU;
Is provided.

Regarding the fifteenth aspect, in the first possible implementation manner, the allocation unit specifically:
Configured to assign a sequence number to each MPDU in the A-MPDU when it is determined that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU) Is done.

  With respect to the fifteenth aspect, in a second possible implementation manner, the sequence number is carried in the medium access control header of the MPDU.

  With respect to the fifteenth aspect, in a third possible implementation manner, when the acknowledgment frame uses the frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap in the compressed BA frame. It is a field.

  With respect to the fifteenth aspect, in a fourth possible implementation manner, the acknowledgment frame further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

According to a sixteenth aspect, an embodiment of the present invention provides a receiving device. This receiving device
A receiving unit configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by a transmitting device, wherein each MAC protocol data unit (MPDU) of an A-MPDU is each MAC protocol data unit ( Receiving unit carrying the MPDU) sequence number;
A determination unit configured to determine an acknowledgment frame, the acknowledgment frame including an indication field used to indicate a reception status of each MPDU in the A-MPDU received by the receiving unit; Each bit is a decision unit used to indicate one MPDU of a sequence of MPDU sequence numbers in the A-MPDU;
A transmission unit configured to transmit an acknowledgment frame determined by the determination unit to the transmission device;
Is provided.

  With respect to the sixteenth aspect, in the first possible implementation manner, the sequence number is carried in the medium access control header of the MPDU.

  Regarding the sixteenth aspect, in a second possible implementation manner, when the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap in the compressed BA frame. It is a field.

  With respect to the sixteenth aspect, in a third possible implementation manner, the acknowledgment frame determined by the determination unit further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

According to a seventeenth aspect, an embodiment of the present invention provides a transmission device. This transmission device
A processor configured to assign a sequence number to each MAC protocol data unit (MPDU) in the aggregate MAC protocol data unit (A-MPDU);
A transceiver configured to transmit an A-MPDU to a receiving device and receive an acknowledgment frame transmitted by the receiving device, wherein each MPDU in the A-MPDU carries a sequence number assigned by the processor. The acknowledgment frame includes an indication field used to indicate the reception status of each MPDU in the A-MPDU, and each bit of the indication field indicates one MPDU of a sequence of sequence numbers in the A-MPDU. Used transceiver, and
Is provided.

With respect to the seventeenth aspect, in a first possible implementation manner, the processor specifically specifies:
Configured to assign a sequence number to each MPDU in the A-MPDU when it is determined that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU) Is done.

  With respect to the seventeenth aspect, in a second possible implementation manner, the sequence number is carried in the medium access control header of the MPDU.

  Regarding the seventeenth aspect, in a third possible implementation manner, when the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap in the compressed BA frame. It is a field.

  With respect to the seventeenth aspect, in a fourth possible implementation manner, the acknowledgment frame further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

According to an eighteenth aspect, an embodiment of the present invention provides a receiving device. This receiving device
A transceiver configured to receive an A-MPDU transmitted by a transmitting device, wherein each MAC protocol data unit (MPDU) of the A-MPDU carries a sequence number of each MAC protocol data unit (MPDU) A transceiver,
A processor configured to determine an acknowledgment frame, wherein the acknowledgment frame includes an indication field used to indicate the reception status of each MPDU in the A-MPDU received by the transceiver, and each of the indication fields The bit is used to indicate one MPDU of a sequence of MPDU sequence numbers in the A-MPDU;
Is provided. The transceiver is further configured to transmit the acknowledgment frame determined by the processor to the transmitting device.

  With respect to the eighteenth aspect, in a first possible implementation manner, the sequence number is carried in the medium access control header of the MPDU.

  Regarding the eighteenth aspect, in a second possible implementation manner, when the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap in the compressed BA frame. It is a field.

  With respect to the eighteenth aspect, in a third possible implementation manner, the acknowledgment frame determined by the processor further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

  By using the four technical solutions provided in the embodiments of the present invention, it is possible to indicate the reception status of A-MPDU including MSDU fragments.

It is the schematic of data transmission using the existing OFDMA technique. FIG. 3 is a schematic structural diagram of a sequence control field of an MPDU according to an embodiment of the present invention. 3 is a schematic flowchart of an A-MPDU reception state instruction method according to an embodiment of the present invention. FIG. 5 is a schematic structural diagram of a per-traffic identifier information field of an M-BA frame according to an embodiment of the present invention. FIG. 3 is a schematic structural diagram of a BA control field of a compressed BA frame according to an embodiment of the present invention. It is a schematic structure figure of the compression BA frame concerning the embodiment of the present invention. 1 is a schematic diagram of data transmission using OFDMA technology according to an embodiment of the present invention. FIG. It is the schematic of the reception instruction | indication field of the 1st BA frame which concerns on embodiment of this invention. It is the schematic of the reception instruction | indication field of the 1st BA frame which concerns on embodiment of this invention. It is the schematic of the reception instruction | indication field of the 2nd BA frame which concerns on embodiment of this invention. 3 is a schematic flowchart of an A-MPDU reception state instruction method according to an embodiment of the present invention. FIG. 6 is a schematic diagram of a block acknowledgment bitmap field of a BA frame according to an embodiment of the present invention. 3 is a schematic flowchart of an MSDU fragment reception state instruction method according to an embodiment of the present invention. It is the schematic of the frame format of the request | requirement frame which concerns on embodiment of this invention. It is the schematic of the frame format of the response frame which concerns on embodiment of this invention. 1 is a schematic diagram of data transmission using OFDMA technology according to an embodiment of the present invention. FIG. 3 is a schematic flowchart of an A-MPDU reception state instruction method according to an embodiment of the present invention. FIG. 3 is a schematic structural diagram of an HT control field according to an embodiment of the present invention. FIG. 3 is a schematic structural diagram of a QoS control field according to an embodiment of the present invention. 1 is a schematic diagram of data transmission using OFDMA technology according to an embodiment of the present invention. FIG. It is a schematic structure figure of the receiver concerning an embodiment of the present invention. It is a schematic structure figure of the receiver concerning an embodiment of the present invention. It is a schematic structure figure of the receiver concerning an embodiment of the present invention. It is a schematic structure figure of the receiver concerning an embodiment of the present invention. 1 is a schematic structural diagram of a transmission device according to an embodiment of the present invention. It is a schematic structure figure of the receiver concerning an embodiment of the present invention. 1 is a schematic structural diagram of a transmission device according to an embodiment of the present invention. It is a schematic structure figure of the receiver concerning an embodiment of the present invention. 1 is a schematic structural diagram of a transmission device according to an embodiment of the present invention. It is a schematic structure figure of the receiver concerning an embodiment of the present invention. 1 is a schematic structural diagram of a transmission device according to an embodiment of the present invention. It is a schematic structure figure of the receiver concerning an embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS The following clearly describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Of course, the described embodiments are only a part of the embodiments of the present invention, but not all. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without ingenuity are intended to be included in the protection scope of the present invention.

  Embodiments of the present invention provide an A-MPDU reception state indication method, an MSDU fragment reception state indication method, a transmission apparatus, and a reception apparatus in order to indicate the reception state of an A-MPDU including an MSDU fragment. The method and apparatus are based on the same inventive concept. Since the principle of problem solving of these methods is similar to the principle of the device, the implementation of the device and the implementation of the method can be referred to each other, and no repeated explanation is provided.

  The present invention relates to a technique for transmitting an A-MPDU including an MSDU fragment. The technique for transmitting an A-MPDU including an MSDU fragment means that the transmitting end transmits a plurality of MPDUs to the receiving end by aggregating the MPDU. Aggregated MPDUs are distinguished using MPDU delimiters. Each MPDU can be obtained by encapsulating an MSDU or MSDU fragment. An MSDU fragment is a segment of MSDU. All fragments except the last fragment must be equal in length and contain even bytes. Optionally, whether the MSDU is evenly fragmented is not limited in the present invention. The MPDU header of the MPDU includes a sheath control field. As shown in FIG. 2, the sheath control field includes a sequence number SN and a fragment number FN. The SN is used to identify the MSDU to which the MSDU or MSDU fragment encapsulated in the MPDU belongs. Each MSDU corresponds to one SN. The FN is used to identify the MSDU fragment encapsulated in the MPDU. MSDU fragments belonging to the same MSDU correspond to different FNs. In the process of transmitting an A-MPDU including an MSDU fragment, if the fragment transmission fails, the fragment can be retransmitted, and it is not necessary to retransmit the MSDU to which the fragment belongs, and the robustness and throughput rate of the network system. Can be improved.

  In an embodiment of the present invention, A-MSDU or A-MSDU fragment can also be encapsulated in MPDU. An A-MSDU fragment is a segment of A-MSDU. For ease of explanation, the MSDU fragment in the following embodiments may be understood as an A-MSDU fragment.

  The technical solution provided in the embodiment of the present invention can be used to indicate the reception status of an A-MPDU including an MSDU fragment. Details are as follows.

Embodiment 1
As shown in FIG. 3, this embodiment of the present invention provides a reception status indication method for A-MPDU. The method includes the following steps.

  S301. The receiving end receives the A-MPDU transmitted by the transmitting end.

  S302. If it is determined that at least one MAC protocol data unit (MPDU) in the A-MPDU is obtained by encapsulating a medium access control service data unit (MSDU) fragment, the receiving end is An acknowledgment frame used to indicate the reception status of the MPDU is transmitted.

  The acknowledgment frame includes a fragment indication field and a reception status field. The fragment indication field is used to indicate that the A-MPDU contains an MPDU obtained by encapsulating an MSDU fragment. The fragment indication field is used to distinguish the type of acknowledgment frame. The reception status field is used to indicate the reception status of each MPDU in the A-MPDU. A predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Each bit in the reception status field is used to indicate one MPDU of the sequence number (SN) sequence in the A-MPDU.

  The acknowledgment frame of the present embodiment may be a BA frame. In order to facilitate the distinction between an acknowledgment frame and an existing BA frame, in the following description, the acknowledgment frame in the present embodiment is described as a first BA frame, and the existing BA frame is described as a second BA frame.

In this embodiment, when it is determined that all the MPDUs in the A-MPDU are obtained by encapsulating the MSDU, the receiving end uses the second BA frame (existing BA frame) to transmit the A-MPDU. Indicates the reception status. The specific method is
When it is determined that all MPDUs in the A-MPDU have been obtained by encapsulating the MSDU, the receiving end transmits a second BA frame used to indicate the reception status of the A-MPDU to the transmitting end. Step to do,
including.

  The second BA frame includes a fragment indication field and a reception status field. The fragment indication field is used to indicate that the A-MPDU indicated by the second BA frame does not contain the MPDU obtained by encapsulating the MSDU fragment. Each bit in the reception status field is used to indicate the reception status of one MPDU of a sequence of sequence numbers (SN) in the A-MPDU.

  The main difference between the first BA frame and the second BA frame is that the first BA frame is used to indicate the reception status of the A-MPDU including the MSDU fragment, and the second BA frame includes the MSDU fragment. It is used to indicate the reception status of no A-MPDU. The first BA frame is a new BA frame provided in this embodiment, and the second BA frame is an existing BA frame. In this embodiment, a fragment indication field is used to distinguish between the first BA frame and the second BA frame.

  In S302 of this embodiment, the receiving end may determine whether or not the A-MPDU includes an MSDU fragment according to a fragment number (FN) field carried in the MPDU in the A-MPDU. The FN field is carried in the sequence control field of the MPDU header of the MPDU.

  If the FN field in the A-MPDU does not contain 0, it indicates that the A-MPDU does not contain an MSDU fragment. If the FN field of at least one MPDU in the A-MPDU does not contain 0, it indicates that the A-MPDU contains an MSDU fragment. Thus, if the receiving end determines that the fragment number FN field carried in at least one MPDU in the A-MPDU transmitted by the transmitting end contains non-zero, the receiving end will have at least one in the A-MPDU. Determine that one MPDU was obtained by encapsulating a fragment of MSDU. That is, the receiving end determines that the A-MPDU transmitted by the transmitting end includes an MSDU fragment. In this case, the receiving end selects the first BA frame and indicates the reception state of the A-MPDU.

  In the present embodiment, the transmission end uses a fragment indication field to distinguish between the first BA frame and the second BA frame. The first BA frame and the second BA frame may use a multi-user block acknowledgment (M-BA) frame format or a compressed BA frame format. The compressed BA frame may be transmitted by a multi-user method such as MU-MIMO or OFDMA, or may be transmitted by a single user method. The fragment indication field can use the following format according to different formats used by the first BA frame and the second BA frame.

  1. The frame format of the M-BA frame or the compressed BA frame is used.

  Both the BA information field of the M-BA frame and the BA information field of the compressed BA frame include a start sequence control field. The start sequence control field includes four reserved bits. The fragment indication field may include one or more of the four reserved bits to indicate that the BA frame is the first BA frame or the second BA frame.

  2. The frame format of the M-BA frame or the compressed BA frame is used.

  Both the M-BA frame and the compressed BA frame include a 4-bit traffic identifier (TIR). The fragment indication field may include one or more bits in the TID field to indicate that the BA frame is a first BA frame or a second BA frame.

  The fragment indication field includes one bit in the TID field. Since the currently used enhanced distributed channel access (EDCA) mechanism uses only three bits of the TID field, the fragment indication field uses the remaining one bit of the TID field to Indicates that the frame is a first BA frame or a second BA frame.

  The fragment indication field includes a plurality of bits in the TID field. The fragment indication field includes a plurality of bits in the TID field to indicate a specific TID value. A specific TID value is used to indicate that the BA frame is a first BA frame or a second BA frame. For example, if the fragment indication field includes four bits in the TID field, the TID value that can be indicated by the four bits is in the range of 0-15, and the specific TID value indicated by the fragment indication field is in the range of 8-15. It may be an integer.

  As shown in FIG. 4, in the case of the M-BA frame, the TID field is located in the per-traffic identifier information (Per TID info) of the BA information field in the M-BA frame. The field may be referred to as a per association identifier information (Per AID Info) field. Each Per TID Info field includes an association identifier (AID) field, a block acknowledgment / acknowledgement policy (BA / ACK policy) indication field, and a TID field. In the case of a compressed BA frame, the TID field is located in the BA control field of the compressed BA frame.

  3. A compressed BA frame format is used.

  FIG. 5 shows the structure of the BA control field of the compressed BA frame. The fragment indication field includes one or more bits out of eight reserved bits in the BA control field of the compressed BA frame.

  4). A compressed BA frame format is used.

The fragment indication field includes a BA control field of the compressed BA frame, a multi-traffic identifier (Multi-Traffic Identifier, Multi-TID) bit, a compressed bitmap bit, and a group cast with retry (Groupcast with retries, GCR) bits. For example, as shown in Table 1 below, when the BA frame variable is “reserved”, the fragment indication field includes the corresponding Multi-TID bit, compressed bitmap bit, and GCR bit in Table 1.

  In the present embodiment, the first BA frame includes a fragment indication field and a reception status field. The reception status field is used to indicate the reception status of each MPDU in the A-MPDU. A predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Each bit in the reception status field is used to indicate one MPDU of the sequence number (SN) sequence in the A-MPDU. Optionally, for the bits of the reception status field used to indicate the reception status of MPDUs having the same SN, the predetermined number of bits is greater than or equal to the maximum allowed number of MSDU fragments.

  For example, the first BA frame uses the structure of the compressed BA frame shown in FIG. The reception status field is a BA bitmap field of the compressed BA frame in FIG. The BA bitmap field contains 8 bytes (ie 64 bits). Assume that the maximum allowable number of MSDU fragments is 4, and that the BA bitmap field uses 4 bits each to indicate the reception status of MPDUs having the same SN. When the MPDU is obtained by encapsulating the MSDU, the reception status of the MPDU may be indicated by using four bits corresponding to the SN of the MPDU, or one of the four bits may be changed. By selection, the reception status of the MPDU may be indicated. Optionally, the first bit of the four bits is selected to indicate the reception status of the MPDU, and the other three bits of the four bits are padded with zeros. When the MPDU is obtained by encapsulating the MSDU fragment, the four bits corresponding to the SN of the MPDU indicate the reception status of the four MPDUs. Four MPDUs are obtained by encapsulating each of the four MSDU fragments having the same SN. If the total number of MSDU fragments is n (where n is less than 4), n bits out of the 4 bits are selected and MPDUs obtained by encapsulating each of the n MSDU fragments respectively. Indicates the reception status. Optionally, the previous n bits of the 4 bits are selected to indicate the MPDU reception status obtained by encapsulating each of the n MSDU fragments, and the remaining bits are padded with zeros. The

  As an example, downlink OFDMA transmission is used. Assuming that the bit is set to 1, it indicates that the reception state is successful, and assuming that the bit is set to 0 indicates that the reception state is failure. As shown in FIG. 7, an access point (AP) transmits downlink data using an OFDMA transmission scheme. The AP sends three A-MPDUs to STA1. A-MPDU1 includes three MPDUs. MPDU1 and MPDU2 are obtained by encapsulating MSDU1 and MSDU2, respectively, and MPDU3 is obtained by encapsulating frame 1 of MSDU3. STA1 normally receives MPDU1 and MPDU2, and fails to receive MPDU3. A-MPDU2 includes three MPDUs. MPDU4 is obtained by encapsulating retransmitted fragment 1 of MSDU3, MPDU5 is obtained by encapsulating fragment 2 of MSDU3, and MPDU6 is obtained by encapsulating MSDU4. STA1 normally receives MPDU4 and MPDU6 and fails to receive MPDU5. A-MPDU 3 includes two MPDUs. MPDU7 and MPDU8 are obtained by encapsulating MSDU5 and MSDU6, respectively. The STA normally receives MPDU 7 and MPDU 8. Since fragment 1 of MSDU3 and fragment 2 of MSDU3 belong to the same MSDU3, fragment 1 and fragment 2 have the same SN.

  The STA transmits the first BA frame to the AP to indicate the reception status of the A-MPDU1 and A-MPDU2. One first BA frame is used to indicate the reception state of A-MPDU1. The SN of the start sequence control field of the one first BA frame is 1 (SN is usually indicated using 12 bits). The reception status field of the one first BA frame is shown in FIG. The other first BA frame is used to indicate the reception status of A-MPDU2. The SN of the start sequence control field of the other first BA frame is 3. The reception status field of the other first BA frame is shown in FIG. The STA transmits the second BA frame to the AP and indicates the reception state of the A-MPDU 3. The SN of the start sequence control field of the second BA frame is 5. The reception status field of the second BA frame is shown in FIG.

  As shown in FIG. 7, after receiving the A-MPDU, the receiving end immediately transmits the first BA frame to the transmitting end. When there is a possibility of delay of the first BA frame, after receiving the A-MPDU, the receiving end can delay the time until the first BA frame is transmitted to the transmitting end.

  In Embodiment 1, when the receiving end receives an A-MPDU transmitted by the transmitting end, and determines that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of the MSDU, the receiving end Transmits to the transmitting end a first block acknowledgment (BA) frame used to indicate the reception status of the A-MPDU. The first BA frame includes a fragment indication field and a reception status field, and the fragment indication field is used to indicate that the A-MPDU includes an MPDU obtained by encapsulating an MSDU fragment, and a reception status. The field is used to indicate the reception status of each MPDU in the A-MPDU, and a predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Each bit in the reception status field is used to indicate one MPDU of the sequence number (SN) sequence in the A-MPDU. By adopting the method provided in Embodiment 1, it is possible to indicate the reception status of an A-MPDU including an MSDU fragment.

Embodiment 2
As shown in FIG. 11, this embodiment of the present invention provides a reception status indication method for A-MPDU. The method includes the following steps.

  S1101. The receiving end receives the A-MPDU transmitted by the transmitting end.

  S1102. The receiving end transmits an acknowledgment frame used to indicate the reception state of the A-MPDU to the transmitting end. The acknowledgment frame includes a block acknowledgment bitmap field. Each bit in the block acknowledgment bitmap field is used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU.

  In the present embodiment, the acknowledgment frame may be a BA frame. The acknowledgment frame is described as a BA frame in the following contents. For the BA frame, the frame format of the compressed BA frame shown in FIG. 6 can be used, or the frame format of the M-BA frame can be used. The frame format of the compressed BA frame is used as an example. The block acknowledgment bitmap field in the compressed BA frame contains 64 bits (8 bytes). If each bit in the Block Acknowledgment Bitmap field is used to indicate the reception status of one MPDU in the A-MPDU, the Block Acknowledgment Bitmap field indicates the reception status of up to 64 MPDUs in the A-MPDU. Can show.

  For example, downlink OFDMA transmission is used as an example. Assuming that the bit is set to 1, it indicates that the reception state is successful, and assuming that the bit is set to 0 indicates that the reception state is failure. As shown in FIG. 7, the AP transmits downlink data using the OFDMA transmission scheme. The AP sends three A-MPDUs to STA1. A-MPDU1 includes three MPDUs. MPDU1 and MPDU2 are obtained by encapsulating MSDU1 and MSDU2, respectively, and MPDU3 is obtained by encapsulating fragment 1 of MSDU3. STA1 normally receives MPDU1 and MPDU2, and fails to receive MPDU3. A-MPDU2 includes three MPDUs. MPDU4 is obtained by encapsulating retransmitted fragment 1 of MSDU3, MPDU5 is obtained by encapsulating fragment 2 of MSDU3, and MPDU6 is obtained by encapsulating MSDU4. STA1 normally receives MPDU4 and MPDU6 and fails to receive MPDU5. A-MPDU 3 includes two MPDUs. MPDU 7 is obtained by encapsulating retransmitted fragment 2 of MSDU3, and MPDU 8 is obtained by encapsulating MSDU4. STA1 normally receives MPDU7 and MPDU8. Since fragment 1 of MSDU3 and fragment 2 of MSDU3 belong to the same MSDU3, fragment 1 and fragment 2 have the same SN. STA1 needs to send three BA frames to the AP. Three acknowledgment frames are used to indicate the reception status of the three A-MPDUs. FIG. 12 shows a block acknowledgment bitmap field of the BA frame used to indicate the reception state of A-MPDU1. Similarly, the block acknowledgment bitmap field of the BA frame used to indicate the reception status of the second A-MPDU contains 101... (64 bits in total) to indicate the reception status of the third A-MPDU. The block acknowledgment bitmap field of the BA frame used contains 11... (64 bits total).

  Since the receiving end may delay the transmission of the BA frame, the BA frame indicating the A-MPDU does not always reach the transmitting end immediately after the transmitting end transmits the A-MPDU. If all first MPDUs of multiple A-MPDUs are obtained by encapsulating different fragments of the same MSDU, the first MPDUs of multiple A-MPDUs have the same SN. For example, the first MPDU in A-MPDU2 and A-MPDU3 in the above example has the same SN, and in this case, the transmitting end needs to distinguish the BA frame used to indicate the reception status of the A-MPDU. There is.

  In the present embodiment, considering the possibility of delay of the BA frame, the BA frame transmitted from the receiving end to the transmitting end further includes an A-MPDU identification field. The A-MPDU identification field is used to distinguish the A-MPDU whose transmitting end has been acknowledged by an acknowledgment frame.

  Optionally, the A-MPDU identification field of the BA frame includes a sequence number (SN) and a fragment number (FN) included in the first MPDU in the A-MPDU indicated by the BA frame. The SN is located in the last 12 bits of the start sequence field of the BA frame (prior art). The FN is located in the four reserved bits before the start sequence field of the BA frame (the method provided in this embodiment, which is different from the prior art). The transmitting end can distinguish different A-MPDUs according to the SN and FN carried in the A-MPDU identification field.

  In the present embodiment, the content of the A-MPDU identification field of the BA frame is not limited to the above content. If the transmitting end can identify the A-MPDU whose reception status is indicated by the BA frame according to the content of the A-MPDU identification field of the BA frame, the A-MPDU identification field may include other contents.

  The technical solution in the second embodiment can be used in combination with the technical solution in the first embodiment.

  In the second embodiment, after the receiving end receives the A-MPDU transmitted by the transmitting end, the receiving end transmits an acknowledgment frame used to indicate the reception state of the A-MPDU to the transmitting end. The acknowledgment frame includes a block acknowledgment bitmap field, and each bit in the block acknowledgment bitmap field is used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU. By adopting the method provided in Embodiment 2, it is possible to indicate the reception status of an A-MPDU including an MSDU fragment. The acknowledgment frame may be the first BA frame in the first embodiment, and is used to indicate the reception state of the A-MPDU including the MSDU fragment.

Embodiment 3
As shown in FIG. 13, this embodiment of the present invention provides a reception status indication method for a medium access control service data unit (MSDU) fragment. The process of interaction between the sending end and the receiving end is as follows.

  S1301. The transmitting end transmits an A-MPDU including the MSDU fragment to the receiving end.

  S1302. The transmitting end transmits a request frame to the receiving end. The request frame is used to indicate the reception status of the MSDU fragment in the A-MPDU.

  S1303. The receiving end transmits a response frame to the transmitting end. The response frame is used to indicate the reception status of the MSDU fragment in the A-MPDU.

  In this embodiment, after the transmitting end transmits an A-MPDU including an MSDU fragment to the receiving end, the receiving end is obtained by encapsulating the MSDU in the transmitting end using an existing BA frame. The reception status of MPDUs existing in is indicated. The BA frame does not indicate the reception status of the MPDU that is obtained by encapsulating the MSDU fragment and is in the A-MPDU. When the transmission end transmits a request frame to the reception end and requests to indicate the reception state of the MSDU fragment, the reception end indicates the reception state of the MSDU fragment using the response frame.

In the present embodiment, the opportunity to transmit the request frame is not limited. The transmitting end can transmit the request frame to the receiving end after transmitting the A-MPDU including the MSDU fragment. In this case, the request frame is used to indicate the reception status of the MSDU fragment in the A-MPDU. The transmitting end can transmit a request frame to the receiving end after transmitting a plurality of A-MPDUs including MSDU fragments. In this case, the request frame is used to request to indicate the reception status of MSDU fragments in a plurality of A-MPDUs. Preferably, the transmitting end transmits a request frame after transmitting all fragments of the MSDU to the receiving end. Specific methods include the following.
When the transmitting end transmits all fragments of MSDU to the receiving end using at least one A-MPDU, the transmitting end transmits a request frame to the receiving end. The request frame is used to request an indication of the reception status of each fragment of the MSDU. The receiving end transmits a response frame to the transmitting end. The response frame is used to indicate the reception status of each MSDU fragment.

  Note that the method of transmitting the request frame and the response frame is not limited in the present embodiment. As an example, downlink data transmission is used. The AP can send a request frame using downlink OFDMA, and the STA can send a response frame using uplink OFDMA. As an example, uplink data transmission is used. The STA may send the request frame using uplink OFDMA contention based random access. Uplink OFDMA contention based random access transmission needs to be triggered by the AP by sending a trigger frame. The STA can transmit the request frame using uplink OFDMA scheduling. Uplink OFDMA scheduling transmissions also need to be triggered by the AP by sending a trigger frame. In the present embodiment, the request frame and the response frame may be transmitted by a multi-user MIMO (Multiple-User-MIMO, MU-MIMO) scheme.

  In the present embodiment, the request frame includes the sequence number (SN) of the MSDU fragment. The frame format of the request frame shown in FIG. 14 is taken as an example. The SN of the MSDU fragment is carried in the SN field of the sequence control field. In accordance with the SN carried in the request frame, the receiving end can know the reception state of the MSDU fragment corresponding to the SN (reception state in which the transmitting end requests an instruction request). The request frame sent by the AP may be for multiple stations. The structure of the request frame is shown in FIG. The reception address (RA) is a broadcast address, the sequence control field includes sequence control subfields of a plurality of stations, and each subfield includes base station identification information and SN. The base station ID may be a related identifier assigned to the base station by the AP. Optionally, the request frame transmitted by the AP includes resource allocation indication information and / or FN (the resource allocation indication information indicates a subchannel or frequency resource block to which the base station returns a response frame), and Parameters such as a modulation and coding scheme (MCS) used by the station to transmit the BA may be included.

  In this embodiment, the response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment. Take the frame format of the response frame shown in FIG. 15 as an example. The SN of the MSDU fragment is carried in the SN field of the sequence control field. The instruction field is a fragment bitmap field, and the length of the instruction field may be set as necessary. If the length of the indication field is 8 bits, the indication field can indicate the reception status of up to 8 MSDU fragments. Each bit is used to indicate a reception state such as one MSDU fragment.

  For example, assuming that the bit is set to 1, it indicates that the reception state is successful, and assuming that the bit is set to 0 indicates that the reception state is failure. The downlink OFDMA data transmission shown in FIG. 16 is used as an example. The AP transmits data using the OFDMA transmission method. The AP sends two A-MPDUs to STA1. A-MPDU1 includes three MPDUs. MPDU1 and MPDU2 are obtained by encapsulating MSDU1 and MSDU2, respectively, and MPDU3 is obtained by encapsulating frame 1 of MSDU3. STA1 normally receives MPDU1 and MPDU2, and fails to receive MPDU3. A-MPDU2 includes four MPDUs. MPDU4 is obtained by encapsulating fragment 2 of MSDU3, MPDU5 is obtained by encapsulating fragment 3 of MSDU3, and MPDU6 and MPDU7 are obtained by encapsulating MSDU4 and MSDU5, respectively. The STA fails to receive MPDU4 and succeeds in receiving MPDU5, MPDU6, and MPDU7. The STA needs to send two BA frames to the AP. The first BA frame indicates a reception state of only MPDU1 and MPDU2 in A-MPDU1. The second BA frame indicates a reception state of only MPDU 6 and MPDU 7 in A-MPDU 2. The request frame sent to the STA by the AP is used to carry the SN of MSDU3 and request to indicate the reception status of fragment 1, fragment 2 and fragment 3 of MSDU3. The response frame transmitted to the AP by the STA carries the SN of MSDU3, and the indication field is 101. The first bit indicates that MSDU3 fragment 1 has been successfully received, the second bit indicates that MSDU3 fragment 2 has failed to be received, and the third bit indicates that MSDU3 fragment 3 has been received. Indicates successful reception.

  In this embodiment, when the transmitting end transmits an A-MPDU including an MSDU fragment to a plurality of receiving ends, the request frame transmitted by the transmitting end returns a response frame to each of the receiving ends. Can be used to direct The request frame includes information about the association between the identification information of each receiving device of the plurality of receiving devices and the sequence number (SN) of the MSDU fragment received by the receiving device. For example, as shown in FIG. 14, the sequence control field of the request frame includes information on the association between each STA identification information of the plurality of receiving ends STA1 to STAn and the sequence number SN of the MSDU fragment corresponding to the STA. including. Each of the plurality of STAs returns a response frame to the AP using the frame format shown in FIG.

  In the third embodiment, the transmitting end transmits an A-MPDU including an MSDU fragment to the receiving end, and the transmitting end transmits a request frame to the receiving end. The request frame is used to indicate the reception status of the MSDU fragment in the A-MPDU. The receiving end transmits a response frame to the transmitting end. The response frame is used to indicate the reception status of the MSDU fragment in the A-MPDU. By adopting the technical solution provided in Embodiment 3, it is possible to indicate the reception status of the MSDU fragment in the A-MPDU.

Embodiment 4
As shown in FIG. 17, this embodiment of the present invention provides a reception status indication method for A-MPDU. The process of interaction between the sending end and the receiving end is as follows.

  S1701. The transmitting end assigns a sequence number to each MAC protocol data unit (MPDU) in the aggregate MAC protocol data unit (A-MPDU).

  S1702. The transmitting end transmits A-MPDU to the receiving end. Each MPDU in the A-MPDU carries the sequence number of each MPDU.

  S1703. The receiving end transmits a block acknowledgment / acknowledgment frame to the transmitting end. The acknowledgment frame includes an indication field used to indicate the reception status of each MPDU in the A-MPDU, and each bit of the indication field indicates one MPDU of the sequence of MPDU sequence numbers in the A-MPDU. Used.

  In this embodiment, optionally, when it is determined that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU), the transmitting end may A sequence number is assigned to each MPDU. In this way, the transmitting end is prevented from assigning sequence numbers to MPDUs in all A-MPDUs, and the operating load on the transmitting end is reduced.

  The acknowledgment frame of the present embodiment may be a BA frame. In order to facilitate the distinction between an acknowledgment frame and an existing BA frame, in the following description, the acknowledgment frame in the present embodiment is a first BA frame and the existing BA frame is a second BA frame. The sequence number assigned to each MPDU in the A-MPDU by the transmitting end is carried in the medium access control (MAC) header of the MPDU. The sequence number is temporarily assigned to the MPDU by the transmitting end. A preferred implementation is that the receiving end uses only the MPDU sequence number to indicate to the transmitting end the reception state of the A-MPDU containing the MSDU fragment. The MPDU can carry the sequence number in several ways:

  Scheme 1: The MPDU sequence number may be carried in the high throughput (HT) control field of the MAC header. FIG. 18 shows a schematic structural diagram of the HT control field. The reserved field of the HT control field is used to indicate that the field is an HT control field of this generation of WLAN systems. Some of the 28 bits of other contents may be used to indicate the temporary sequence number of the MPDU. Alternatively, the sequence number of the MPDU using the access category, AC constraint indication bit in the HT control field and the reverse direction grant / more physical layer convergence procedure protocol unit (reverse direction grant / more PPDU) indication bit May be indicated. Since one A-MPDU contains a maximum of 64 MPDUs, 5 bits are preferably used to indicate the sequence number of the MPDU.

  Scheme 2: The sequence number of the MPDU may be carried in the quality of service (QoS) control field of the MAC header. FIG. 19 shows a schematic structural diagram of the QoS control field. Some of the 8 bits in the transmit opportunity limit field / queue size field / reserved (TXOP limit / queue size / reserved) control field may be used to indicate the sequence number of the MPDU. Optionally, any bit other than the 8 bits of the QoS control field is used to indicate that the QoS control field carries the sequence number of the MPDU.

  In the present embodiment, the first BA frame (the BA frame provided in the present embodiment) is used to indicate the reception status of the A-MPDU including the MSDU fragment, and the second BA frame (the existing BA frame). ) Is used to indicate the reception status of an A-MPDU that does not include an MSDU fragment. In this embodiment, if the receiving end determines that the FN field of all MPDUs in the received A-MPDU contains only 0, it indicates that the A-MPDU does not contain an MSDU fragment. In this case, the reception end feeds back the reception state of each MPDU in the A-MPDU to the transmission end using the second BA frame. This is prior art and will not be described in detail here.

  In order to distinguish between the first BA frame and the second BA frame, both the first BA frame and the second BA frame further include a fragment indication field. The fragment indication field of the first BA frame is used to indicate that at least one MPDU in the A-MPDU indicated by the first BA frame was obtained by encapsulating the MSDU fragment. . The fragment indication field of the second BA frame is used to indicate that all MPDUs in the A-MPDU indicated by the second BA frame have been obtained by encapsulating the MSDU. The receiving end can determine whether the A-MPDU indicated by the BA frame includes an MSDU fragment using the fragment indication field of the BA frame. The specific format used by the fragment indication fields of the first BA frame and the second BA frame is as follows.

  1. The frame format of the M-BA frame or the compressed BA frame is used.

  Both the BA information field of the M-BA frame and the BA information field of the compressed BA frame include a start sequence control field. The start sequence control field includes four reserved bits. The fragment indication field may include one or more of the four reserved bits to indicate whether the A-MPDU indicated by the BA frame includes an MSDU fragment.

  2. The frame format of the M-BA frame or the compressed BA frame is used.

  Both the M-BA frame and the compressed BA frame include a 4-bit traffic identifier (TIR). The fragment indication field may include one or more bits in the TID field to indicate whether the A-MPDU indicated by the BA frame includes an MSDU fragment.

  The fragment indication field includes one bit in the TID field. Since the currently used enhanced distributed channel access (EDCA) mechanism uses only three bits of the TID field, the fragment indication field uses the remaining one bit of the TID field to It may indicate whether the A-MPDU indicated by the frame contains an MSDU fragment.

  The fragment indication field includes a plurality of bits in the TID field. The fragment indication field includes a plurality of bits in the TID field to indicate a specific TID value. A specific TID value is used to indicate whether the A-MPDU indicated by the BA frame contains an MSDU fragment. For example, if the fragment indication field includes four bits in the TID field, the TID value that can be indicated by the four bits is in the range of 0-15, and the specific TID value indicated by the fragment indication field is in the range of 8-15. It may be an integer.

  As shown in FIG. 4, in the case of the M-BA frame, the TID field is located in the per-traffic identifier information (Per TID info) of the BA information field in the M-BA frame. Each Per TID info field includes an association identifier (AID) field, a block acknowledgment / acknowledgement policy (BA / ACK policy) indication field, and a TID field. In the case of a compressed BA frame, the TID field is located in the BA control field of the compressed BA frame.

  3. A compressed BA frame format is used.

  FIG. 5 shows the structure of the BA control field of the compressed BA frame. The fragment indication field includes one or more bits out of eight reserved bits in the BA control field of the compressed BA frame.

  4). A compressed BA frame format is used.

The fragment indication field includes a BA control field of the compressed BA frame, a multi-traffic identifier (Multi-Traffic Identifier, Multi-TID) bit, a compressed bitmap bit, and a group cast with retry (Groupcast with retries, GCR) bits. For example, as shown in Table 2, when the BA frame variable is “reserved”, the fragment indication field includes the corresponding Multi-TID bit, compression bitmap bit, and GCR bit in Table 1. In this case, the BA frame is used to indicate that the A-MPDU contains an MSDU fragment.

  In the present embodiment, the first BA frame may use the frame format of the compressed BA frame. The indication field included in the BA frame is a block acknowledgment bitmap field in the compressed BA frame. Each bit in the block acknowledgment bitmap field is used to indicate one MPDU of a sequence of MPDU sequence numbers in the A-MPDU.

  For example, assuming that the bit is set to 1, it indicates that the reception state is successful, and assuming that the bit is set to 0 indicates that the reception state is failure. The downlink OFDMA data transmission shown in FIG. 20 is used as an example. The AP transmits data using the OFDMA transmission method. The AP sends two A-MPDUs to the STA. A-MPDU1 includes three MPDUs. MPDU1, MPDU2, and MPDU3 are obtained by encapsulating MSDU1, MSDU2, and MSDU3, respectively, and the STA normally receives MPDU1, MPDU2, and MPDU3. A-MPDU2 includes four MPDUs. MPDU4 is obtained by encapsulating fragment 1 of MSDU4, MPDU5 is obtained by encapsulating fragment 2 of MSDU4, and MPDU6 and MPDU7 are obtained by encapsulating MSDU5 and MSDU6, respectively. The STA fails to receive MPDU4 and succeeds in receiving MPDU5, MPDU6, and MPDU7. Since A-MPDU2 contains an MSDU fragment, the AP assigns sequence numbers to all MPDUs in A-MPDU2. Assume that the sequence numbers corresponding to MPDU4 to MPDU7 are 1 to 4, respectively.

  The STA sends two BA frames to the AP. The transmitted first BA frame is a second BA frame (existing BA frame), and is used to indicate the reception state of each MPDU in the order of the sequence number SN in A-MPDU1. The starting SN is 1. Assume that the length of the indication field in the reception state is 64 bits, the SN of the start field of the first BA frame is 1, and the indication field is 111... (Total 64 bits). The previous three bits are used to indicate the reception status of MPDU1 to MPDU3 in order, and the other bits are padded with zeros. The transmitted second BA frame is the first BA frame (the BA frame provided in this embodiment), and is used to indicate the reception status of each MPDU in the order of the MPDU sequence in A-MPDU2. Assume that the length of the indication field in the reception state is 64 bits, the SN of the start field of the second BA frame is 4, and the indication field is 0111... (64 bits in total). The previous four bits are used to indicate the reception status of MPDU 4 to MPDU 7 in order, and the other bits are padded with zeros.

  In Embodiment 4, if it is determined that at least one MAC protocol data unit (MPDU) in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU), the transmitting end A sequence number is assigned to each MPDU in the A-MPDU, and the transmitting end transmits the A-MPDU to the receiving end. Each MPDU in the A-MPDU carries the sequence number of each MPDU. The receiving end transmits a block acknowledgment (BA) frame to the transmitting end. The BA frame includes an indication field used to indicate the reception status of each MPDU in the A-MPDU, and each bit of the indication field indicates one MPDU of a sequence of MPDU sequence numbers in the A-MPDU. Used. By adopting the technical solution provided in Embodiment 4, it is possible to indicate the reception status of an A-MPDU including an MSDU fragment.

Embodiment 5
Based on Embodiment 1, the present invention further provides a receiving device. The receiving device may use the method provided in the embodiment corresponding to FIG. Referring to FIG. 21, the reception device 2100 includes a reception unit 2101, a determination unit 2102, and a transmission unit 2103.

  The receiving unit 2101 is configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device.

  The determining unit 2102 determines that at least one MAC protocol data unit (MPDU) in the A-MPDU received by the receiving unit 2101 is obtained by encapsulating a fragment of a medium access control service data unit (MSDU). And is configured to determine an acknowledgment frame used to indicate the reception status of the A-MPDU.

  The transmission unit 2103 is configured to transmit the acknowledgment frame determined by the determination unit 2102 to the transmission device.

  The acknowledgment frame includes a fragment indication field and a reception status field. The fragment indication field is used to indicate that the A-MPDU contains an MPDU obtained by encapsulating an MSDU fragment. The reception status field is used to indicate the reception status of each MPDU in the A-MPDU. A predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Each bit in the reception status field is used to indicate one MPDU of the sequence number (SN) sequence in the A-MPDU.

Optionally, when determining that at least one MPDU in the A-MPDU received by the receiving unit 2101 was obtained by encapsulating a fragment of the MSDU, the determining unit 2102 is specifically configured as follows: Is done.
When determining that the fragment number (FN) field contained in at least one MPDU in the A-MPDU also contains non-zero, the decision unit 2102 encapsulates the MSDU fragment in at least one MPDU in the A-MPDU. It was determined that it was obtained.

Optionally, when the acknowledgment frame uses a multi-user block acknowledgment (M-BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the M-BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field in the M-BA frame;
Is used.

Optionally, when the acknowledgment frame uses a compressed block acknowledgment (BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the compressed BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field of a BA control field in a compressed BA frame, or
A format in which the fragment indication field includes one or more bits out of eight reserved bits of the BA control field of the compressed BA frame, or
A format in which the fragment indication field includes a multi-traffic identifier (Multi-TID) bit, a compressed bitmap bit, and a GCR (Groupcast with Retries) bit of the BA control field of the compressed BA frame;
Is used.

  Optionally, for the bits of the reception status field used to indicate the reception status of MPDUs having the same SN, the predetermined number of bits is greater than or equal to the maximum allowed number of MSDU fragments.

  In addition, the division of the unit of this embodiment of this invention is an illustration, is only a logical function division, and another division may exist in actual implementation. In addition, the functional units in the embodiments may be integrated into one processing unit, or each of the units may physically exist alone, or two or more units may be integrated into one unit. May be. The integrated unit may be realized in the form of hardware or may be realized in the form of a software functional unit.

  If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored on a computer-readable storage medium. Based on such an understanding, the technical solution of the present application may be realized in the form of a software product, in essence, or a part that contributes to the prior art, or all or part of the technical solution. The computer software product is stored in a storage medium so that a computer device (which may be a personal computer, a server, a network device, etc.) or a processor executes all or part of the method steps of the present embodiment. Includes several instructions for ordering. Any of the above storage media that can store program codes, such as USB flash drives, removable hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, optical disks, etc. Media.

  Based on Embodiment 1, the present invention further provides a receiving device. The receiving apparatus may use the method provided in the embodiment corresponding to FIG. 3, and may be the same apparatus as the receiving apparatus shown in FIG. Referring to FIG. 22, the reception device 2200 includes a transceiver 2201, a processor 2202, a bus 2203, and a memory 2204.

  The transceiver 2201, the processor 2202, and the memory 2204 are interconnected using a bus 2203. The bus 2203 may be a peripheral component interconnect (abbreviated PCI) bus, an extended industry standard architecture (abbreviated EISA) bus, or the like. The bus can be classified into an address bus, a data bus, a control bus, and the like. For ease of explanation, in FIG. 22 only one thick line is used to represent the bus, but this does not mean that there is only one bus or one type of bus.

  The transceiver 2201 is configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device.

  When the processor 2202 determines that at least one MAC protocol data unit (MPDU) in the A-MPDU received by the transceiver 2201 is obtained by encapsulating a fragment of a medium access control service data unit (MSDU) , Configured to determine an acknowledgment frame used to indicate the reception status of the A-MPDU.

  The transceiver 2201 is further configured to transmit the acknowledgment frame determined by the processor 2202 to the transmitting device.

  The acknowledgment frame includes a fragment indication field and a reception status field. The fragment indication field is used to indicate that the A-MPDU contains an MPDU obtained by encapsulating an MSDU fragment. The reception status field is used to indicate the reception status of each MPDU in the A-MPDU. A predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Each bit in the reception status field is used to indicate one MPDU of the sequence number (SN) sequence in the A-MPDU.

Optionally, the processor 2202 determines that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of an MSDU.
When at least one MPDU in the A-MPDU determines that the fragment number (FN) field included in at least one MPDU in the A-MPDU includes non-zero, the processor 2202 encapsulates the MSDU fragment. Determining that it was obtained by
including.

Optionally, when the acknowledgment frame uses a multi-user block acknowledgment (M-BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the M-BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field in the M-BA frame;
Is used.

Optionally, when the acknowledgment frame uses a compressed block acknowledgment (BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of the start sequence control field of the BA information field in the compressed BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field of a BA control field in a compressed BA frame, or
A format in which the fragment indication field includes one or more bits out of eight reserved bits of the BA control field of the compressed BA frame, or
A format in which the fragment indication field includes a multi-traffic identifier (Multi-TID) bit, a compressed bitmap bit, and a GCR (Groupcast with Retries) bit of the BA control field of the compressed BA frame;
Is used.

  Optionally, for the bits of the reception status field used to indicate the reception status of MPDUs having the same SN, the predetermined number of bits is greater than or equal to the maximum allowed number of MSDU fragments.

  The receiving device 2200 further includes a memory 2204 configured to store a program and the like. Specifically, the program may include program code. The program code includes computer operation instructions. The memory 2204 may include random access memory (RAM) and may further include non-volatile memory, such as at least one magnetic disk memory. The processor 2202 executes an application program stored in the memory 2204 in order to implement the A-MPDU reception state instruction method.

Embodiment 6
Based on Embodiment 2, the present invention further provides a receiving device. The receiving apparatus may use the method provided in the embodiment corresponding to FIG. Referring to FIG. 23, the receiving apparatus 2300 includes a receiving unit 2301, a determining unit 2302, and a transmitting unit 2303.

  The receiving unit 2301 is configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device.

  The determining unit 2302 is configured to determine an acknowledgment frame that is used to indicate a reception state of the A-MPDU received by the receiving unit 2301. The acknowledgment frame includes a block acknowledgment bitmap field. Each bit in the block acknowledgment bitmap field is used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU.

  The transmission unit 2303 is configured to transmit the acknowledgment frame determined by the determination unit 2302 to the transmission device.

  Optionally, the acknowledgment frame further includes an A-MPDU identification field. The A-MPDU identification field is used by the transmitting device to distinguish between an A-MPDU and another A-MPDU transmitted by the transmitting device.

  Optionally, the A-MPDU identification field includes a sequence number (SN) and a fragment number (FN) included in the first MPDU in the A-MPDU.

  In addition, the division of the unit of this embodiment of this invention is an illustration, is only a logical function division, and another division may exist in actual implementation. In addition, the functional units in the embodiments may be integrated into one processing unit, or each of the units may physically exist alone, or two or more units may be integrated into one unit. May be. The integrated unit may be realized in the form of hardware or may be realized in the form of a software functional unit.

  If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored on a computer-readable storage medium. Based on such an understanding, the technical solution of the present application may be realized in the form of a software product, in essence, or a part that contributes to the prior art, or all or part of the technical solution. The computer software product is stored in a storage medium so that a computer device (which may be a personal computer, a server, a network device, etc.) or a processor executes all or part of the method steps of the present embodiment. Includes several instructions for ordering. The storage medium includes any medium that can store program codes, such as a USB flash drive, a removable hard disk, a ROM, a RAM, a magnetic disk, and an optical disk.

  Based on Embodiment 2, the present invention further provides a receiving device. The receiving apparatus may use the method provided in the embodiment corresponding to FIG. 11, and may be the same apparatus as the receiving apparatus shown in FIG. Referring to FIG. 24, the receiving apparatus 2400 includes a transceiver 2401, a processor 2402, a bus 2403, and a memory 2404.

  The transceiver 2401, the processor 2402, and the memory 2404 are interconnected using a bus 2403. The bus 2403 may be a PCI bus, an EISA bus, or the like. The bus can be classified into an address bus, a data bus, a control bus, and the like. For ease of explanation, only one thick line is used in FIG. 24 to represent the bus, but this does not mean that there is only one bus or one type of bus.

  The transceiver 2401 is configured to receive the aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device.

  The processor 2402 is configured to determine an acknowledgment frame used to indicate the reception status of the A-MPDU received by the transceiver 2401. The acknowledgment frame includes a block acknowledgment bitmap field. Each bit in the block acknowledgment bitmap field is used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU.

  The transceiver 2401 is further configured to transmit the acknowledgment frame determined by the processor 2402 to the transmitting device.

  Optionally, the acknowledgment frame further includes an A-MPDU identification field. The A-MPDU identification field is used by the transmitting device to distinguish between an A-MPDU and another A-MPDU transmitted by the transmitting device.

  Optionally, the A-MPDU identification field includes a sequence number (SN) and a fragment number (FN) included in the first MPDU in the A-MPDU.

  Receiving device 2400 further includes a memory 2404 configured to store programs and the like. Specifically, the program may include program code. The program code includes computer operation instructions. The memory 2404 may include RAM and may further include non-volatile memory, such as at least one disk memory. The processor 2402 executes an application program stored in the memory 2404 in order to implement the A-MPDU reception state instruction method.

Embodiment 7
Based on Embodiment 3, the present invention further provides a transmission apparatus. The transmitting device may use the method provided in the embodiment corresponding to FIG. Referring to FIG. 25, the transmission device 2500 includes a transmission unit 2501 and a reception unit 2502.

  The sending unit 2501 is configured to send an aggregate MAC protocol data unit (A-MPDU) including a medium access control service data unit (MSDU) fragment to the receiving device and send a request frame to the receiving device. The request frame is used to request an indication of the reception status of the MSDU fragment included in the A-MPDU.

  The receiving unit 2502 is configured to receive a response frame transmitted by the receiving device. The response frame is used to indicate the reception status of the MSDU fragment included in the A-MPDU transmitted by the transmission unit 2501.

  Optionally, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Optionally, when the transmission unit 2501 transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame is used to request the plurality of receiving devices to respectively transmit a response frame to the transmitting device. . The request frame includes information regarding the association between the identification information of each of the plurality of receiving apparatuses and the sequence number (SN) of the MSDU fragment received by the receiving apparatus.

  Optionally, when the transmission unit 2501 transmits all fragments of the MSDU to the receiving device using at least one A-MPDU, the request frame transmitted by the transmission unit 2501 indicates an indication of the reception status of each fragment of the MSDU. The response frame used to request and received by the receiving unit is used to indicate the reception status of each fragment of the MSDU.

  Based on Embodiment 3, the present invention further provides a receiving device. The receiving apparatus may use the method provided in the embodiment corresponding to FIG. Referring to FIG. 26, the receiving apparatus 2600 includes a receiving unit 2601, a determining unit 2602, and a transmitting unit 2603.

  The receiving unit 2601 receives an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device and including a medium access control service data unit (MSDU) fragment, and receives a request frame transmitted by the transmitting device. Composed. The request frame is used to request an indication of the reception status of the MSDU fragment included in the A-MPDU.

  The determining unit 2602 is configured to determine a response frame. The response frame is used to indicate the reception status of the MSDU fragment included in the A-MPDU received by the reception unit 2601.

  The transmission unit 2603 is configured to transmit the response frame determined by the determination unit to the transmission device.

  Optionally, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Optionally, when the transmitting device transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame received by the receiving unit 2601 transmits a response frame to each of the plurality of receiving devices. Used to request. The request frame includes the sequence number (SN) of the MSDU fragment received by each of the plurality of receiving apparatuses.

  Optionally, when the receiving unit 2601 receives all fragments of the MSDU transmitted by the transmitting device using at least one A-MPDU, the request frame received by the receiving unit 2601 is the reception status of each fragment of the MSDU. The response frame transmitted to the transmission device by the transmission unit 2603 is used to indicate the reception status of each fragment of the MSDU.

  In addition, the division of the unit of this embodiment of this invention is an illustration, is only a logical function division, and another division may exist in actual implementation. In addition, the functional units in the embodiments may be integrated into one processing unit, or each of the units may physically exist alone, or two or more units may be integrated into one unit. May be. The integrated unit may be realized in the form of hardware or may be realized in the form of a software functional unit.

  If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored on a computer-readable storage medium. Based on such an understanding, the technical solution of the present application may be realized in the form of a software product, in essence, or a part that contributes to the prior art, or all or part of the technical solution. The computer software product is stored in a storage medium so that a computer device (which may be a personal computer, a server, a network device, etc.) or a processor executes all or part of the method steps of the present embodiment. Includes several instructions for ordering. The storage medium includes any medium that can store program codes, such as a USB flash drive, a removable hard disk, a ROM, a RAM, a magnetic disk, and an optical disk.

  Based on Embodiment 3, the present invention further provides a transmission apparatus. The transmission apparatus may use the method provided in the embodiment corresponding to FIG. 13 and may be the same apparatus as the transmission apparatus shown in FIG. Referring to FIG. 27, a transmission apparatus 2700 includes a transceiver 2701, a bus 2702, and a memory 2703.

  The transceiver 2701 and the memory 2703 are interconnected using a bus 2702. The bus 2702 may be a PCI bus, an EISA bus, or the like. The bus can be classified into an address bus, a data bus, a control bus, and the like. For ease of explanation, only one thick line is used in FIG. 27 to represent the bus, but this does not mean that there is only one bus or one type of bus.

  The transceiver 2701 transmits an aggregate MAC protocol data unit (A-MPDU) including a medium access control service data unit (MSDU) fragment to the receiving device, transmits a request frame to the receiving device, and is transmitted by the receiving device. It is configured to receive a response frame. The request frame is used to request an indication of the reception status of the MSDU fragment included in the A-MPDU, and the response frame is used to indicate the reception status of the MSDU fragment included in the A-MPDU.

  Optionally, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Optionally, when the transceiver 2701 sends an A-MPDU containing an MSDU fragment to a plurality of receiving devices, the request frame is used to request each of the plurality of receiving devices to send a response frame to the transmitting device. . The request frame includes information regarding the association between the identification information of each of the plurality of receiving apparatuses and the sequence number (SN) of the MSDU fragment received by the receiving apparatus.

  Optionally, when the transceiver 2701 transmits all fragments of the MSDU to the receiver using at least one A-MPDU, the request frame transmitted by the transceiver 2701 indicates an indication of the reception status of each fragment of the MSDU. The response frame used to request and received by the transceiver 2701 is used to indicate the reception status of each fragment of the MSDU.

  The transmission apparatus 2700 further includes a memory 2703 configured to store a program and the like. Specifically, the program may include program code. The program code includes computer operation instructions. Memory 2703 may include RAM and may further include non-volatile memory, such as at least one disk memory.

  Based on Embodiment 3, the present invention further provides a receiving device. The receiving apparatus may use the method provided in the embodiment corresponding to FIG. 13, and may be the same apparatus as the receiving apparatus shown in FIG. Referring to FIG. 28, a receiving apparatus 2800 includes a transceiver 2801, a processor 2802, a bus 2803, and a memory 2804.

  The transceiver 2801, the processor 2802, and the memory 2804 are interconnected using a bus 2803. The bus 2803 may be a PCI bus, an EISA bus, or the like. The bus can be classified into an address bus, a data bus, a control bus, and the like. For ease of explanation, in FIG. 28 only one thick line is used to represent the bus, but this does not mean that there is only one bus or one type of bus.

  The transceiver 2801 receives an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device and including a medium access control service data unit (MSDU) fragment, and receives a request frame transmitted by the transmitting device. Composed. The request frame is used to request an indication of the reception status of the MSDU fragment included in the A-MPDU.

  The processor 2802 is configured to determine a response frame. The response frame is used to indicate the reception status of the MSDU fragment included in the A-MPDU received by the transceiver 2801.

  The transceiver 2801 is further configured to transmit the response frame determined by the processor 2802 to the transmitting device.

  Optionally, the request frame includes the sequence number (SN) of the MSDU fragment. The response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.

  Optionally, when the transmitting device transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame is used to request each of the plurality of receiving devices to transmit a response frame to the transmitting device. The request frame includes the sequence number (SN) of the MSDU fragment received by each of the plurality of receiving apparatuses.

  Optionally, when the transceiver 2801 receives all fragments of the MSDU transmitted by the transmitting device using at least one A-MPDU, the request frame received by the transceiver 2801 is the reception status of each fragment of the MSDU. The response frame transmitted to the transmitting apparatus by the transceiver 2801 is used to indicate the reception status of each fragment of the MSDU.

  Receiving device 2800 further includes a memory 2804 configured to store a program and the like. Specifically, the program may include program code. The program code includes computer operation instructions. The memory 2804 may include RAM and may further include non-volatile memory, such as at least one disk memory. The processor 2802 executes an application program stored in the memory 2804 to indicate the reception status of the MSDU fragment in the A-MPDU.

Embodiment 8
Based on Embodiment 4, the present invention further provides a transmission apparatus. The transmitting apparatus may use the method provided in the embodiment corresponding to FIG. Referring to FIG. 29, the transmission apparatus 2900 includes an allocation unit 2901, a transmission unit 2902, and a reception unit 2903.

  The assignment unit 2901 is configured to assign a sequence number to each MAC protocol data unit (MPDU) in the aggregate MAC protocol data unit (A-MPDU).

  The sending unit 2902 is configured to send A-MPDU to the receiving device. Each MPDU in the A-MPDU carries a sequence number assigned by the assignment unit 2901.

  The receiving unit 2903 is configured to receive an acknowledgment frame transmitted by the receiving device. The acknowledgment frame includes an indication field that is used to indicate the reception status of each MPDU in the A-MPDU transmitted by the transmission unit 2902. Each bit of the indication field is used to indicate one MPDU of a sequence of sequence numbers in the A-MPDU.

Optionally, the allocation unit 2901 specifically includes
Configured to assign a sequence number to each MPDU in the A-MPDU when it is determined that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU) Is done.

  Optionally, the sequence number is carried in the medium access control header of the MPDU.

  Optionally, when the acknowledgment frame uses a compressed block acknowledgment (BA) frame format, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.

  Optionally, the acknowledgment frame further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

  Based on Embodiment 4, the present invention further provides a receiving device. The receiving apparatus may use the method provided in the embodiment corresponding to FIG. Referring to FIG. 30, the reception device 3000 includes a reception unit 3001, a determination unit 3002, and a transmission unit 3003.

  The receiving unit 3001 is configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device. Each MAC protocol data unit (MPDU) of the A-MPDU carries the sequence number of each MAC protocol data unit (MPDU).

  The determining unit 3002 is configured to determine an acknowledgment frame. The acknowledgment frame includes an indication field used to indicate the reception status of each MPDU in the A-MPDU received by the receiving unit 3001. Each bit of the indication field is used to indicate one MPDU of a sequence of MPDU sequence numbers in the A-MPDU.

  The transmission unit 3003 is configured to transmit the acknowledgment frame determined by the determination unit 3002 to the transmission device.

  Optionally, the sequence number is carried in the medium access control header of the MPDU.

  Optionally, when the acknowledgment frame uses a compressed block acknowledgment (BA) frame format, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.

  Optionally, the acknowledgment frame further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

  In addition, the division of the unit of this embodiment of this invention is an illustration, is only a logical function division, and another division may exist in actual implementation. In addition, the functional units in the embodiments may be integrated into one processing unit, or each of the units may physically exist alone, or two or more units may be integrated into one unit. May be. The integrated unit may be realized in the form of hardware or may be realized in the form of a software functional unit.

  If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored on a computer-readable storage medium. Based on such an understanding, the technical solution of the present application may be realized in the form of a software product, in essence, or a part that contributes to the prior art, or all or part of the technical solution. The computer software product is stored in a storage medium so that a computer device (which may be a personal computer, a server, a network device, etc.) or a processor executes all or part of the method steps of the present embodiment. Includes several instructions for ordering. The storage medium includes any medium that can store program codes, such as a USB flash drive, a removable hard disk, a ROM, a RAM, a magnetic disk, and an optical disk.

  Based on Embodiment 4, the present invention further provides a transmission apparatus. The transmission apparatus may use the method provided in the embodiment corresponding to FIG. 17 and may be the same apparatus as the transmission apparatus shown in FIG. Referring to FIG. 31, the transmission device 3100 includes a processor 3101, a transceiver 3102, a bus 3103, and a memory 3104.

  The processor 3101, the transceiver 3102, and the memory 3104 are interconnected using a bus 3103. The bus 3103 may be a PCI bus, an EISA bus, or the like. The bus can be classified into an address bus, a data bus, a control bus, and the like. For ease of explanation, FIG. 31 uses only one thick line to represent a bus, but this does not mean that there is only one bus or one type of bus.

  The processor 3101 is configured to assign a sequence number to each MPDU in the A-MPDU.

  The transceiver 3102 is configured to transmit A-MPDU to the receiving device. Each MPDU in the A-MPDU carries a sequence number assigned by the processor 3101 and receives an acknowledgment frame transmitted by the receiving device. The acknowledgment frame includes an indication field that is used to indicate the reception status of each MPDU in the A-MPDU. Each bit of the indication field is used to indicate one MPDU of a sequence of sequence numbers in the A-MPDU.

Optionally, processor 3101 may specifically:
Configured to assign a sequence number to each MPDU in the A-MPDU when it is determined that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU) Is done.

  Optionally, the sequence number is carried in the medium access control header of the MPDU.

  Optionally, when the acknowledgment frame uses a compressed block acknowledgment (BA) frame format, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.

  Optionally, the acknowledgment frame further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

  The transmission apparatus 3100 further includes a memory 3104 configured to store a program and the like. Specifically, the program may include program code. The program code includes computer operation instructions. The memory 3104 may include RAM and may further include non-volatile memory, such as at least one disk memory. The processor 3101 executes an application program stored in the memory 3104 in order to implement the A-MPDU reception state instruction method.

  Based on Embodiment 4, the present invention further provides a receiving device. The receiving apparatus may use the method provided in the embodiment corresponding to FIG. 17, and may be the same apparatus as the transmitting apparatus shown in FIG. Referring to FIG. 32, the reception device 3200 includes a transceiver 3201, a processor 3202, a bus 3203, and a memory 3204.

  The transceiver 3201, the processor 3202, and the memory 3204 are interconnected using a bus 3203. The bus 3203 may be a PCI bus, an EISA bus, or the like. The bus can be classified into an address bus, a data bus, a control bus, and the like. For ease of explanation, in FIG. 32 only one thick line is used to represent the bus, but this does not mean that there is only one bus or one type of bus.

  The transceiver 3201 is configured to receive A-MPDU transmitted by the transmission device. Each MAC protocol data unit (MPDU) of the A-MPDU carries the sequence number of each MAC protocol data unit (MPDU).

  The processor 3202 is configured to determine an acknowledgment frame. The acknowledgment frame includes an indication field used to indicate the reception status of each MPDU in the A-MPDU received by the transceiver 3201. Each bit of the indication field is used to indicate one MPDU of a sequence of MPDU sequence numbers in the A-MPDU.

  The transceiver 3201 is further configured to transmit the acknowledgment frame determined by the processor 3202 to the transmitting device.

  Optionally, the sequence number is carried in the medium access control header of the MPDU.

  Optionally, when the acknowledgment frame uses a compressed block acknowledgment (BA) frame format, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.

  Optionally, the acknowledgment frame further includes a fragment indication field. The fragment indication field is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of the MSDU.

  Those skilled in the art will appreciate that embodiments of the invention may be provided as a method, system or computer program product. Therefore, the present invention can use a hardware-only embodiment, a software-only embodiment, or a combination of software and hardware. In addition, the present invention can adopt the form of a computer program product that is mounted on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.). This includes computer usable program code.

  The present invention has been described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It should be noted that the computer program instructions can be used to implement each process and / or block in the flowchart and / or block diagram and a combination of the process and / or block in the flowchart and / or block diagram. These computer program instructions can be provided to the processor of a general purpose computer, special purpose computer, embedded processor, or any other programmable data processing device to produce a machine, and thus the computer or any other The instructions executed by the processor of the programmable data processing device generate a device for implementing a particular function in one or more processes in the flowchart and / or one or more blocks in the block diagram.

  Such computer program instructions may be stored in a computer readable memory and may instruct a computer or any other programmable data processing device to operate in a particular manner and, as a result, stored in a computer readable memory. The instruction generates an artifact that includes the instruction device. The instruction device implements a specific function in one or more blocks in the block diagram in one or more processes in the flowchart diagram.

  These computer instructions are loaded into a computer or another programmable data processing device, and a series of operations and steps are performed on the computer or other programmable device to produce a computer-executed process. Accordingly, instructions executed on a computer or another programmable device provide steps for implementing a particular function in one or more processes in the flowchart and / or one or more blocks in the block diagram.

  Although some preferred embodiments of the present invention have been described, those skilled in the art will be able to change and modify these embodiments once they learn the basic inventive concept. Accordingly, the following claims are intended to be construed to include the preferred embodiments and all changes and modifications that fall within the scope of the invention.

  Of course, those skilled in the art will be able to make various modifications and variations to the embodiments of the present invention without departing from the scope of the embodiments of the present invention. To the extent that such modifications and variations fall within the scope of protection defined by the appended claims and their equivalents, the present invention is intended to encompass them.

Fragmentation technology was introduced in the 802.11b protocol that supports low rate data transmission. The so-called fragmentation technique, the medium access control (media access control, MAC) in layer, MAC service data unit (MAC service data unit, MSDU) or MAC management protocol data unit (MAC management protocol data unit, MMPDU ) is plural Meaning divided into segments, each segment is called a fragment of MSDU or MMPDU. When the fragment reception fails, the fragmentation technique can retransmit only the fragment for which reception has failed, and there is no need to retransmit the entire MSDU or MMPDU, thereby improving the robustness and throughput of the network.

To support higher data transmission rates, an aggregate MAC protocol data unit (aggregate- MAC protocol data unit, A -MPDU) technology was introduced in 802.11n protocol. A-MPDU technology means that an MSDU or an aggregate MAC service data unit (aggregate MSDU, A-MSDU) is encapsulated to obtain a MAC protocol data unit ( MAC protocol data unit, MPDU). Is transmitted in an aggregated manner. Aggregate MPDUs are distinguished using MPDU delimiters. In one A-MPDU, up to 64 encapsulated MSDUs can be aggregated for transmission. In the A-MPDU technique, the reception state of the A-MPDU is fed back using a block acknowledgment (BA) frame. Each bit in the BA bitmap included in the BA frame correspondingly indicates the reception status of one MSDU or A-MSDU. The first bit of the BA bitmap correspondingly indicates the reception status of the MSDU of the first sequence number (sequence number, SN) in the BA start sequence control field.

Hereinafter, technical solutions in the embodiments of the present invention will be described clearly with reference to the accompanying drawings in the embodiments of the present invention. Of course, the described embodiments are only a part of the embodiments of the present invention, but not all. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any ingenuity should be included in the protection scope of the present invention.

The acknowledgment frame of the present embodiment may be a BA frame. In order to facilitate the distinction between an acknowledgment frame and an existing BA frame, in the following description, the acknowledgment frame in the present embodiment is a first BA frame and the existing BA frame is a second BA frame. Sequence number assigned to each MPDU in the A-MPDU by transmitting stage, medium access control MPDU (media access control, MAC) is carried in the header. The sequence number is temporarily assigned to the MPDU by the transmitting end. A preferred implementation is that the receiving end uses only the MPDU sequence number to indicate to the transmitting end the reception state of the A-MPDU containing the MSDU fragment. The MPDU can carry the sequence number in several ways:

The fragment indication field includes a BA control field of the compressed BA frame, a multi-traffic identifier (Multi-Traffic Identifier, Multi-TID) bit, a compressed bitmap bit, and a group cast with retry (Groupcast with retries, GCR) bits. For example, as shown in Table 2, when the BA frame variable is “reserved”, the fragment indication field includes the corresponding Multi-TID bit, compression bitmap bit, and GCR bit in Table 2 . In this case, the BA frame is used to indicate that the A-MPDU contains an MSDU fragment.

Optionally, when determining that at least one MPDU in the A-MPDU received by the receiving unit 2101 is obtained by encapsulating a fragment of the MSDU, the determining unit 2102 specifically specifies :
When it is determined that the fragment number (FN) field included in at least one MPDU in the A-MPDU includes other than 0, the at least one MPDU in the A-MPDU is obtained by encapsulating the MSDU fragment. configured to determine that.

Based on Embodiment 4, the present invention further provides a receiving device. The receiving device may use the method provided in the embodiment corresponding to FIG. 17, and may be the same device as the receiving device shown in FIG. Referring to FIG. 32, the reception device 3200 includes a transceiver 3201, a processor 3202, a bus 3203, and a memory 3204.

Claims (50)

An aggregate MAC protocol data unit (A-MPDU) reception status instruction method comprising:
A receiving end receiving the A-MPDU transmitted by the transmitting end;
If it is determined that at least one MAC protocol data unit (MPDU) in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU), the receiving end is at the transmitting end, Transmitting an acknowledgment frame used to indicate a reception state of the A-MPDU;
Including
The acknowledgment frame includes a fragment indication field and a reception status field, and the fragment indication field is used to indicate that the A-MPDU includes an MPDU obtained by encapsulating an MSDU fragment, and the reception status. A field is used to indicate the reception status of each MPDU in the A-MPDU, and a predetermined number of bits in the reception status field are used to indicate the reception status of MPDUs having the same sequence number (SN). , Each bit in the reception status field is used to indicate one MPDU of a sequence of sequence numbers (SN) in the A-MPDU.
Method. The step of the receiving end determining that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of MSDU;
When it is determined that the fragment number (FN) field included in at least one MPDU in the A-MPDU includes other than 0, the receiving end encapsulates the MSDU fragment in at least one MPDU in the A-MPDU. Determining that it has been obtained by
The method of claim 1 comprising: When the acknowledgment frame uses a multi-user block acknowledgment (M-BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of a start sequence control field of a BA information field in the M-BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field in the M-BA frame;
The method according to claim 1, wherein When the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the fragment indication field is
A format in which the fragment indication field includes one or more bits of four reserved bits of a start sequence control field of a BA information field in the compressed BA frame; or
The fragment indication field includes one or more bits of a traffic identifier (TID) field of a BA control field in the compressed BA frame, or
The fragment indication field includes one or more bits out of eight reserved bits of the BA control field of the compressed BA frame, or
A format in which the fragment indication field includes a multi-traffic identifier (Multi-TID) bit, a compressed bitmap bit, and a GCR (Groupcast with Retries) bit of a BA control field of the compressed BA frame;
The method according to claim 1, wherein For the bits of the reception status field used to indicate the reception status of the MPDU having the same SN, the bits of the predetermined number of bits are greater than or equal to the maximum number of allowable MSDU fragments.
The method of claim 1. A receiving unit configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device;
When it is determined that at least one MAC protocol data unit (MPDU) in the A-MPDU received by the receiving unit is obtained by encapsulating a fragment of a medium access control service data unit (MSDU); A determination unit configured to determine an acknowledgment frame used to indicate the reception status of the MPDU;
A transmission unit configured to transmit the acknowledgment frame determined by the determination unit to the transmission device;
A receiving device comprising:
The acknowledgment frame includes a fragment indication field and a reception status field, and the fragment indication field is used to indicate that the A-MPDU includes an MPDU obtained by encapsulating an MSDU fragment, and the reception status. A field is used to indicate the reception status of each MPDU in the A-MPDU, and a predetermined number of bits in the reception status field is used to indicate the reception status of MPDUs having the same sequence number (SN). Each bit in the reception status field is used to indicate one MPDU of a sequence of sequence numbers (SN) in the A-MPDU,
Receiver device. When determining that at least one MPDU in the A-MPDU received by the receiving unit was obtained by encapsulating a fragment of MSDU, the determining unit specifically:
When it is determined that the fragment number (FN) field included in at least one MPDU in the A-MPDU includes other than 0, the at least one MPDU in the A-MPDU encapsulates the MSDU fragment. Configured to determine that
The receiving device according to claim 6. When the acknowledgment frame uses a multi-user block acknowledgment (M-BA) frame format, the fragment indication field is:
A format in which the fragment indication field includes one or more bits of four reserved bits of a start sequence control field of a BA information field in the M-BA frame, or
A format in which the fragment indication field includes one or more bits of a traffic identifier (TID) field in the M-BA frame;
The receiving apparatus according to claim 6, wherein: When the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the fragment indication field is
A format in which the fragment indication field includes one or more bits of four reserved bits of a start sequence control field of a BA information field in the compressed BA frame; or
The fragment indication field includes one or more bits of a traffic identifier (TID) field of a BA control field in the compressed BA frame, or
The fragment indication field includes one or more bits out of eight reserved bits of the BA control field of the compressed BA frame, or
A format in which the fragment indication field includes a multi-traffic identifier (Multi-TID) bit, a compressed bitmap bit, and a GCR (Groupcast with Retries) bit of a BA control field of the compressed BA frame;
The receiving apparatus according to claim 6, wherein: For the bits of the reception status field used to indicate the reception status of the MPDU having the same SN, the bits of the predetermined number of bits are greater than or equal to the maximum number of allowable MSDU fragments.
The receiving device according to claim 6. An aggregate MAC protocol data unit (A-MPDU) reception status instruction method comprising:
A receiving end receiving the A-MPDU transmitted by the transmitting end;
The receiving end transmits an acknowledgment frame used to indicate the reception state of the A-MPDU to the transmitting end, wherein the acknowledgment frame includes a block acknowledgment bitmap field, and the block acknowledgment bitmap Each bit in the field is used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU;
Including methods. The acknowledgment frame further includes an A-MPDU identification field, and the A-MPDU identification field is used by the transmitting end to distinguish the A-MPDU from another A-MPDU transmitted by the transmitting end. ,
The method of claim 11. The A-MPDU identification field includes a sequence number (SN) and a fragment number (FN) included in a first MPDU in the A-MPDU.
The method of claim 12. A receiving unit configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting device;
A decision unit configured to determine an acknowledgment frame used to indicate a reception status of the A-MPDU received by the receiving unit, the acknowledgment frame including a block acknowledgment bitmap field; Each bit in the block acknowledgment bitmap field is a decision unit used to indicate the reception status of one MAC protocol data unit (MPDU) in the A-MPDU;
A transmission unit configured to transmit the acknowledgment frame determined by the determination unit to the transmission device;
A receiving device. The acknowledgment frame further includes an A-MPDU identification field that is used by the transmitting device to distinguish between the A-MPDU and another A-MPDU transmitted by the transmitting device. ,
The receiving device according to claim 14. The A-MPDU identification field includes a sequence number (SN) and a fragment number (FN) included in a first MPDU in the A-MPDU.
The receiving device according to claim 15. A method for indicating a reception state of a medium access control service data unit (MSDU) fragment, comprising:
A transmitting end transmitting an aggregate MAC protocol data unit (A-MPDU) including an MSDU fragment to a receiving end;
The transmitting end transmitting a request frame to the receiving end, wherein the request frame is used to request an indication of a reception state of the MSDU fragment included in the A-MPDU;
The transmitting end receiving a response frame transmitted by the receiving end, wherein the response frame is used to indicate the reception status of the MSDU fragment included in the A-MPDU;
Including methods. The request frame includes a sequence number (SN) of the MSDU fragment, and the response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.
The method of claim 17. When the transmitting end transmits an A-MPDU including an MSDU fragment to a plurality of receiving ends, the request frame is used to request each of the plurality of receiving ends to transmit a response frame to the transmitting end. The request frame includes a sequence number (SN) of each MSDU fragment received by the plurality of receiving ends,
The method of claim 17. When the transmitting end transmits all MSDU fragments to the receiving end using at least one A-MPDU, the request frame transmitted by the transmitting end indicates an indication of the reception status of each fragment of the MSDU. The response frame used to request and received by the sending end is used to indicate the reception status of each fragment of the MSDU;
The method of claim 17. A method for indicating a reception state of a medium access control service data unit (MSDU) fragment, comprising:
A receiving end receiving an aggregate MAC protocol data unit (A-MPDU) transmitted by the transmitting end and including an MSDU fragment;
The receiving end receives a request frame transmitted by the transmitting end, and the request frame is used to request an indication of a reception state of the MSDU fragment included in the A-MPDU. Steps,
The receiving end transmitting a response frame to the transmitting end, wherein the response frame is used to indicate the reception status of the MSDU fragment included in the A-MPDU;
Including methods. The request frame includes a sequence number (SN) of the MSDU fragment, and the response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.
The method of claim 21. When the transmitting end transmits an A-MPDU including an MSDU fragment to a plurality of receiving ends, the request frame is used to request each of the plurality of receiving ends to transmit a response frame to the transmitting end. The request frame includes information about an association between identification information of each receiving end of the plurality of receiving ends and a sequence number (SN) of an MSDU fragment received by the receiving end,
The method of claim 21. When the receiving end receives all fragments of the MSDU transmitted by the transmitting end using at least one A-MPDU, the request frame received by the receiving end is the reception status of each fragment of the MSDU The response frame transmitted to the transmitting end by the receiving end is used to indicate the receiving state of each fragment of the MSDU.
The method of claim 21. A transmission unit configured to transmit an aggregate MAC protocol data unit (A-MPDU) including a medium access control service data unit (MSDU) fragment to a receiving device and to transmit a request frame to the receiving device; The request frame is a transmission unit used to request an indication of a reception state of the MSDU fragment included in the A-MPDU;
A receiving unit configured to receive a response frame transmitted by the receiving device, wherein the response frame indicates the reception status of the MSDU fragment included in the A-MPDU transmitted by the transmitting unit. A receiving unit used to indicate; and
A transmission apparatus comprising: The request frame includes a sequence number (SN) of the MSDU fragment, and the response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.
The transmission device according to claim 25. When the transmitting unit transmits an A-MPDU including an MSDU fragment to a plurality of receiving apparatuses, the request frame is used to request each of the plurality of receiving apparatuses to transmit a response frame to the transmitting apparatus. The request frame includes information about an association between identification information of each receiving device of the plurality of receiving devices and a sequence number (SN) of an MSDU fragment received by the receiving device.
The transmission device according to claim 25. When the transmitting unit transmits all fragments of MSDU to the receiving device using at least one A-MPDU, the request frame transmitted by the transmitting unit indicates an indication of the reception status of each fragment of the MSDU. The response frame used to request and received by the receiving unit is used to indicate the reception status of each fragment of the MSDU;
The transmission device according to claim 25. A reception configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by a transmitting device and including a medium access control service data unit (MSDU) fragment and to receive a request frame transmitted by the transmitting device. A receiving unit used to request an indication of a reception state of the MSDU fragment included in the A-MPDU;
A determination unit configured to determine a response frame, wherein the response frame is used to indicate the reception status of the MSDU fragment included in the A-MPDU received by the receiving unit Unit,
A transmission unit configured to transmit the response frame determined by the determination unit to the transmission device;
A receiving device. The request frame includes a sequence number (SN) of the MSDU fragment, and the response frame includes the SN of the MSDU fragment and an indication field used to indicate the reception status of the MSDU fragment.
The receiving device according to claim 29. When the transmitting device transmits an A-MPDU including an MSDU fragment to a plurality of receiving devices, the request frame received by the receiving unit transmits a response frame to the transmitting device to each of the plurality of receiving devices. The request frame includes sequence numbers (SN) of MSDU fragments respectively received by the plurality of receiving devices;
The receiving device according to claim 29. When the receiving unit receives all fragments of the MSDU transmitted by the transmitting device using at least one A-MPDU, the request frame received by the receiving unit is a reception state of each fragment of the MSDU. The response frame transmitted to the transmitter by the transmitter unit is used to indicate the reception status of each fragment of the MSDU.
The receiving device according to claim 29. An aggregate MAC protocol data unit (A-MPDU) reception status instruction method comprising:
A transmitting end assigning a sequence number to each MAC protocol data unit (MPDU) in the A-MPDU;
The transmitting end transmitting the A-MPDU to the receiving end, each MPDU in the A-MPDU carrying the sequence number of each MPDU;
The transmitting end receiving an acknowledgment frame transmitted by the receiving end, wherein the acknowledgment frame includes an indication field used to indicate a reception status of each MPDU in the A-MPDU; Each bit of the indication field is used to indicate one MPDU of a sequence of sequence numbers in the A-MPDU;
Including methods. The transmitting end assigns a sequence number to each MAC protocol data unit (MPDU) in the A-MPDU,
When it is determined that at least one MPDU in the A-MPDU has been obtained by encapsulating a fragment of a medium access control service data unit (MSDU), the transmitting end may send to each MPDU in the A-MPDU. Assigning the sequence number;
34. The method of claim 33, comprising: The sequence number is carried in the medium access control header of the MPDU.
34. The method of claim 33. When the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.
34. The method of claim 33. The acknowledgment frame further includes a fragment indication field, which is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of an MSDU.
34. The method of claim 33. An aggregate MAC protocol data unit (A-MPDU) reception status instruction method comprising:
A receiving end receiving an A-MPDU transmitted by the transmitting end, wherein each MAC protocol data unit (MPDU) of the A-MPDU carries a sequence number of each MAC protocol data unit (MPDU); Steps,
The receiving end transmitting an acknowledgment frame to the transmitting end, wherein the acknowledgment frame includes an indication field used to indicate a reception state of each MPDU in the A-MPDU; Each bit is used to indicate one MPDU of a sequence of MPDU sequence numbers in the A-MPDU;
Including methods. The sequence number is carried in the medium access control header of the MPDU.
40. The method of claim 38. When the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.
40. The method of claim 38. Before the step in which the receiving end transmits an acknowledgment frame to the transmitting end,
When each MPDU in the A-MPDU is determined to carry the sequence number of each MPDU, the receiving end is obtained by at least one MPDU in the A-MPDU encapsulating an MSDU fragment. The step of determining that
Further including
The acknowledgment frame further includes a fragment indication field, which is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of an MSDU.
40. The method of claim 38. An allocation unit configured to assign a sequence number to each MAC protocol data unit (MPDU) in the aggregate MAC protocol data unit (A-MPDU);
A transmission unit configured to transmit the A-MPDU to a receiving device, wherein each MPDU in the A-MPDU carries the sequence number assigned by the assignment unit;
A receiving unit configured to receive an acknowledgment frame transmitted by the receiving device, wherein the acknowledgment frame indicates a reception state of each MPDU in the A-MPDU transmitted by the transmitting unit. A receiving unit used to indicate one MPDU of a sequence of sequence numbers in the A-MPDU;
A transmission apparatus comprising: Specifically, the allocation unit is:
Assigning the sequence number to each MPDU in the A-MPDU when it is determined that at least one MPDU in the A-MPDU is obtained by encapsulating a fragment of a medium access control service data unit (MSDU) Configured as
43. The transmission device according to claim 42. The sequence number is carried in the medium access control header of the MPDU.
43. The transmission device according to claim 42. When the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.
43. The transmission device according to claim 42. The acknowledgment frame further includes a fragment indication field, which is used to indicate that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of an MSDU.
43. The transmission device according to claim 42. A receiving unit configured to receive an aggregate MAC protocol data unit (A-MPDU) transmitted by a transmitting device, wherein each MAC protocol data unit (MPDU) of the A-MPDU is a MAC protocol data unit. A receiving unit carrying a sequence number of (MPDU);
A determination unit configured to determine an acknowledgment frame, the acknowledgment frame including an indication field used to indicate a reception state of each MPDU in the A-MPDU received by the receiving unit; Each bit of the indication field is used to indicate one MPDU of a sequence of MPDU sequence numbers in the A-MPDU,
A transmission unit configured to transmit the acknowledgment frame determined by the determination unit to the transmission device;
A receiving device. The sequence number is carried in the medium access control header of the MPDU.
48. The receiving device according to claim 47. When the acknowledgment frame uses a frame format of a compressed block acknowledgment (BA) frame, the indication field included in the acknowledgment frame is a block acknowledgment bitmap field in the compressed BA frame.
48. The receiving device according to claim 47. The acknowledgment frame determined by the determination unit further includes a fragment indication field, which indicates that at least one MPDU in the A-MPDU was obtained by encapsulating a fragment of MSDU. Used for
48. The receiving device according to claim 47.

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